Android银行卡输入格式化程序

银行卡因为比较长所以在用户输入时我们最好格式化显示了这样可以防止输错银行卡了，今天我们来看一篇关于Android银行卡输入格式化程序吧，具体如下。

我们在输入银行卡号时希望能按格式显示，而不是单纯显示一堆数字，下面一段代码可实现银行卡号格式化输入。

//银行卡号码的格式
   public void bankCardNumAddSpace(final EditText mEditText) {
       mEditText.addTextChangedListener(new TextWatcher() {
           int beforeTextLength = 0;
           int onTextLength = 0;
           boolean isChanged = false;
 
           int location = 0;// 记录光标的位置
           private char[] tempChar;
           private StringBuffer buffer = new StringBuffer();
           int konggeNumberB = 0;
 
           @Override
           public void beforeTextChanged(CharSequence s, int start, int count,
                                         int after) {
               beforeTextLength = s.length();
               if (buffer.length() > 0) {
                   buffer.delete(0, buffer.length());
               }
               konggeNumberB = 0;
               for (int i = 0; i < s.length(); i++) {
                   if (s.charAt(i) == ' ') {
                       konggeNumberB++;
                   }
               }
           }
 
           @Override
           public void onTextChanged(CharSequence s, int start, int before,
                                     int count) {
               onTextLength = s.length();
               buffer.append(s.toString());
               if (onTextLength == beforeTextLength || onTextLength <= 3
                       || isChanged) {
                   isChanged = false;
                   return;
               }
               isChanged = true;
           }
 
           @Override
           public void afterTextChanged(Editable s) {
               if (isChanged) {
                   location = mEditText.getSelectionEnd();
                   int index = 0;
                   while (index < buffer.length()) {
                       if (buffer.charAt(index) == ' ') {
                           buffer.deleteCharAt(index);
                       } else {
                           index++;
                       }
                   }
 
                   index = 0;
                   int konggeNumberC = 0;
                   while (index < buffer.length()) {
                       if ((index == 4 || index == 9 || index == 14 || index == 19)) {
                           buffer.insert(index, ' ');
                           konggeNumberC++;
                       }
                       index++;
                   }
 
                   if (konggeNumberC > konggeNumberB) {
                       location += (konggeNumberC - konggeNumberB);
                   }
 
                   tempChar = new char[buffer.length()];
                   buffer.getChars(0, buffer.length(), tempChar, 0);
                   String str = buffer.toString();
                   if (location > str.length()) {
                       location = str.length();
                   } else if (location < 0) {
                       location = 0;
                   }
 
                   mEditText.setText(str);
                   Editable etable = mEditText.getText();
                   Selection.setSelection(etable, location);
                   isChanged = false;
               }
           }
       });
   }

下面我们来看一篇关于Android开发之底部导航实现总结，希望这篇文章能够帮助到各位朋友，有兴趣的同学可以和小编一起来看看吧。

底部导航有很多种实现方式。目前比较常用的是RadioGroup+Fragment，FragmentTabHost+Fragment，BottomNavigationBar三种方式，下面分别介绍：

一、RadioGroup+Fragment方式：这种方式是最老的实现方式，代码复杂。

1.布局：

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">
 
 <FrameLayout
 android:id="@+id/content"
 android:layout_width="match_parent"
 android:layout_height="0dp"
 android:layout_weight="1.0"
 android:background="@color/white" />
 
 <View
 android:layout_width="match_parent"
 android:layout_height="1dp"
 android:background="@color/view" />
 
 <RadioGroup
 android:id="@+id/group_home"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_gravity="bottom"
 android:background="#4A192F"
 android:gravity="center_vertical"
 android:orientation="horizontal">
 
 <RadioButton
 android:id="@+id/radio_main"
 style="@style/home_tab_bottom"
 android:checked="true"
 android:drawableTop="@drawable/home_tab_main_selector"
 android:text="首页"
 android:textColor="@color/titlebar_bg"
 android:textSize="14sp" />
 
 <RadioButton
 android:id="@+id/radio_assortment"
 style="@style/home_tab_bottom"
 android:drawableTop="@drawable/home_tab_assortment_selector"
 android:text="分类"
 android:textColor="@color/white"
 android:textSize="14sp" />
 
 <RadioButton
 android:id="@+id/radio_car"
 style="@style/home_tab_bottom"
 android:drawableTop="@drawable/home_tab_car_selector"
 android:text="购物车"
 android:textColor="@color/white"
 android:textSize="14sp" />
 
 <RadioButton
 android:id="@+id/radio_recommend"
 style="@style/home_tab_bottom"
 android:drawableTop="@drawable/home_tab_recommend_selector"
 android:text="热榜"
 android:textColor="@color/white"
 android:textSize="14sp" />
 
 <RadioButton
 android:id="@+id/radio_my"
 style="@style/home_tab_bottom"
 android:drawableTop="@drawable/home_tab_my_selector"
 android:text="我的"
 android:textColor="@color/white"
 android:textSize="14sp" />
 
 </RadioGroup>
</LinearLayout>

2.java代码：

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.widget.RadioButton;
import android.widget.RadioGroup;
 
import cn.zmit.bottomnavigationdemo.R;
import cn.zmit.bottomnavigationdemo.fragment.FiveFragment;
import cn.zmit.bottomnavigationdemo.fragment.FourFragment;
import cn.zmit.bottomnavigationdemo.fragment.OneFragment;
import cn.zmit.bottomnavigationdemo.fragment.ThreeFragment;
import cn.zmit.bottomnavigationdemo.fragment.TwoFragment;
 
/**
 * Created by Administrator on 2016/8/9.
 * RadioGroup+Fragment
 */
public class OneActivity extends FragmentActivity {
 private RadioGroup mRadioGroup;
 
private RadioButton radio_main;//主页
 
private RadioButton radio_my;//我的
 
private RadioButton radio_assortment;//分类
 
private RadioButton radio_car;//购物车
 
private RadioButton radio_recommend;//热榜
 
private OneFragment mOneFragment;//主页
 private TwoFragment mTwoFragment;//分类
 private ThreeFragment mThreeFragment;//购物车
 private FourFragment mFourFragment;//热榜
 private FiveFragment mFiveFragment;//我的
 private FragmentManager fragmentManager;
 
@Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_one);
 fragmentManager = getSupportFragmentManager();
 init();//获取ID
 setTab(1);//设置首页为默认显示
 }
 
 /**
 * 获取ID
 */
 private RadioGroup.OnCheckedChangeListener onCheckedChangeListener;
 private int checkId;
 
private void init() {
 mRadioGroup = (RadioGroup) findViewById(R.id.group_home);
 radio_main = (RadioButton) findViewById(R.id.radio_main);
 radio_my = (RadioButton) findViewById(R.id.radio_my);
 radio_assortment = (RadioButton) findViewById(R.id.radio_assortment);
 radio_car = (RadioButton) findViewById(R.id.radio_car);
 radio_recommend = (RadioButton) findViewById(R.id.radio_recommend);
 onCheckedChangeListener = new RadioGroup.OnCheckedChangeListener() {
 @Override
 public void onCheckedChanged(RadioGroup group, int checkedId) {
 if (checkId != checkedId) {
 switch (checkedId) {
 case R.id.radio_main:
 setTab(1);
 changeTab(1);
 break;
 case R.id.radio_my:
 changeTab(5);
 setTab(5);
 break;
 case R.id.radio_assortment:
 changeTab(2);
 setTab(2);
 break;
 case R.id.radio_car:
 setTab(3);
 changeTab(3);
 break;
 case R.id.radio_recommend:
 setTab(4);
 changeTab(4);
 break;
 }
 }
 checkId = checkedId;
 }
 };
 mRadioGroup.setOnCheckedChangeListener(onCheckedChangeListener);
 }
 
/***
 * 切换tab时的变化
 *
 * @param i
 */
 private void changeTab(int i) {
 
switch (i) {
 case 1:
 radio_main.setTextColor(getResources().getColor(R.color.titlebar_bg));
 radio_my.setTextColor(getResources().getColor(R.color.white));
 radio_assortment.setTextColor(getResources().getColor(R.color.white));
 radio_recommend.setTextColor(getResources().getColor(R.color.white));
 radio_car.setTextColor(getResources().getColor(R.color.white));
 break;
 case 2:
 radio_main.setTextColor(getResources().getColor(R.color.white));
 radio_assortment.setTextColor(getResources().getColor(R.color.titlebar_bg));
 radio_my.setTextColor(getResources().getColor(R.color.white));
 radio_recommend.setTextColor(getResources().getColor(R.color.white));
 radio_car.setTextColor(getResources().getColor(R.color.white));
 
break;
 case 3:
 radio_main.setTextColor(getResources().getColor(R.color.white));
 radio_my.setTextColor(getResources().getColor(R.color.white));
 radio_car.setTextColor(getResources().getColor(R.color.titlebar_bg));
 radio_recommend.setTextColor(getResources().getColor(R.color.white));
 radio_assortment.setTextColor(getResources().getColor(R.color.white));
 break;
 case 4:
 radio_main.setTextColor(getResources().getColor(R.color.white));
 radio_my.setTextColor(getResources().getColor(R.color.white));
 radio_car.setTextColor(getResources().getColor(R.color.white));
 radio_recommend.setTextColor(getResources().getColor(R.color.titlebar_bg));
 radio_assortment.setTextColor(getResources().getColor(R.color.white));
 break;
 case 5:
 radio_main.setTextColor(getResources().getColor(R.color.white));
 radio_my.setTextColor(getResources().getColor(R.color.titlebar_bg));
 radio_car.setTextColor(getResources().getColor(R.color.white));
 radio_recommend.setTextColor(getResources().getColor(R.color.white));
 radio_assortment.setTextColor(getResources().getColor(R.color.white));
 break;
 }
 }
 
/***
 * 切换tab
 */
 private void setTab(int index) {
 FragmentTransaction transaction = fragmentManager.beginTransaction();
 hideFragments(transaction);
 switch (index) {
 case 1:
 if (mOneFragment == null) {
 mOneFragment = new OneFragment();
 transaction.add(R.id.content, mOneFragment);
 } else {
 transaction.show(mOneFragment);
 mOneFragment.setUserVisibleHint(true);
 }
 break;
 case 2:
 if (mTwoFragment == null) {
 mTwoFragment = new TwoFragment();
 transaction.add(R.id.content, mTwoFragment);
 } else {
 transaction.show(mTwoFragment);
 mTwoFragment.setUserVisibleHint(true);
 }
 break;
 case 3:
 if (mThreeFragment == null) {
 mThreeFragment = new ThreeFragment();
 transaction.add(R.id.content, mThreeFragment);
 } else {
 transaction.show(mThreeFragment);
 mThreeFragment.setUserVisibleHint(true);
 }
 break;
 case 4:
 if (mFourFragment == null) {
 mFourFragment = new FourFragment();
 transaction.add(R.id.content, mFourFragment);
 } else {
 transaction.show(mFourFragment);
 mFourFragment.setUserVisibleHint(true);
 }
 break;
 case 5:
 if (mFiveFragment == null) {
 mFiveFragment = new FiveFragment();
 transaction.add(R.id.content, mFiveFragment);
 } else {
 transaction.show(mFiveFragment);
 mFiveFragment.setUserVisibleHint(true);
 }
 break;
 }
 transaction.commit();
 }
 
private void hideFragments(FragmentTransaction transaction) {
 
if (mOneFragment != null) {
 transaction.hide(mOneFragment);
 }
 if (mTwoFragment != null) {
 transaction.hide(mTwoFragment);
 }
 if (mThreeFragment != null) {
 transaction.hide(mThreeFragment);
 }
 if (mFourFragment != null) {
 transaction.hide(mFourFragment);
 }
 if (mFiveFragment != null) {
 transaction.hide(mFiveFragment);
 }
 }
}
效果图：

RadioGroup+Fragment方式

二、FragmentTabHost+Fragment：现在常用的实现方式，代码相对简洁一些。

1.布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical" >
 
 <FrameLayout
 android:id="@+id/realtabcontent"
 android:layout_width="match_parent"
 android:layout_height="0dip"
 android:layout_weight="1" />
 
 <android.support.v4.app.FragmentTabHost
 android:id="@android:id/tabhost"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:background="#4A192F">
 
 <FrameLayout
 android:id="@android:id/tabcontent"
 android:layout_width="0dp"
 android:layout_height="0dp"
 android:layout_weight="0" />
 </android.support.v4.app.FragmentTabHost>
 
</LinearLayout>

tab_item_view布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical">
 
<ImageView
android:id="@+id/imageview"
android:layout_marginTop="5dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="false"
android:padding="3dp"/>
 
<TextView
android:id="@+id/textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/tab_text"
android:textSize="14sp"/>
 
</LinearLayout>

2.java代码：

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTabHost;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.TabHost;
import android.widget.TextView;
 
import cn.zmit.bottomnavigationdemo.R;
import cn.zmit.bottomnavigationdemo.fragment.FiveFragment;
import cn.zmit.bottomnavigationdemo.fragment.FourFragment;
import cn.zmit.bottomnavigationdemo.fragment.OneFragment;
import cn.zmit.bottomnavigationdemo.fragment.ThreeFragment;
import cn.zmit.bottomnavigationdemo.fragment.TwoFragment;
 
/**
 * Created by Administrator on 2016/8/9.
 * FragmentTabHost+Fragment
 */
public class TwoActivity extends FragmentActivity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_two);
 initView();
 }
 
private FragmentTabHost mTabHost;
 
/**
 * 布局填充器
 *
 */
 private LayoutInflater mLayoutInflater;
 
/**
 * Fragment数组界面
 *
 */
 private Class mFragmentArray[] = { OneFragment.class, TwoFragment.class,
 ThreeFragment.class, FourFragment.class, FiveFragment.class };
 /**
 * 存放图片数组
 *
 */
 private int mImageArray[] = { R.drawable.home_tab_main_selector,
 R.drawable.home_tab_assortment_selector, R.drawable.home_tab_car_selector,
 R.drawable.home_tab_recommend_selector, R.drawable.home_tab_my_selector };
 
/**
 * 选修卡文字
 *
 */
 private String mTextArray[] = { "首页", "分类", "购物车", "热榜", "我的" };
 
/**
 * 初始化组件
 */
 private void initView() {
 mLayoutInflater = LayoutInflater.from(this);
 
// 找到TabHost
 mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
 mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
 // 得到fragment的个数
 int count = mFragmentArray.length;
 for (int i = 0; i &amp;amp;lt; count; i++) {
 // 给每个Tab按钮设置图标、文字和内容
 TabHost.TabSpec tabSpec = mTabHost.newTabSpec(mTextArray[i])
 .setIndicator(getTabItemView(i));
 // 将Tab按钮添加进Tab选项卡中
 mTabHost.addTab(tabSpec, mFragmentArray[i], null);
 }
 }
 
/**
 *
 * 给每个Tab按钮设置图标和文字
 */
 private View getTabItemView(int index) {
 View view = mLayoutInflater.inflate(R.layout.tab_item_view, null);
 ImageView imageView = (ImageView) view.findViewById(R.id.imageview);
 imageView.setBackgroundResource(mImageArray[index]);
 TextView textView = (TextView) view.findViewById(R.id.textview);
 textView.setText(mTextArray[index]);
 return view;
 }
}

FragmentTabHost+Fragment方式

三、BottomNavigationBar：最新的实现方式。

在使用之前，需要在Android Studio

1.布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">
 
 <FrameLayout
 android:id="@+id/layFrame"
 android:layout_width="match_parent"
 android:layout_height="0dp"
 android:layout_weight="1" />
 
 <com.ashokvarma.bottomnavigation.BottomNavigationBar
 android:id="@+id/bottom_navigation_bar"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_gravity="bottom" />
 
</LinearLayout>

2.java代码：

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
 
import com.ashokvarma.bottomnavigation.BottomNavigationBar;
import com.ashokvarma.bottomnavigation.BottomNavigationItem;
 
import java.util.ArrayList;
 
import cn.zmit.bottomnavigationdemo.R;
import cn.zmit.bottomnavigationdemo.fragment.AssortmentFragment;
import cn.zmit.bottomnavigationdemo.fragment.CarFragment;
import cn.zmit.bottomnavigationdemo.fragment.MainFragment;
import cn.zmit.bottomnavigationdemo.fragment.MySpaceFragment;
import cn.zmit.bottomnavigationdemo.fragment.RecommendFragment;
 
/**
 * Created by Administrator on 2016/8/9.
 * BottomNavigationBar
 */
public class ThreeActivity extends AppCompatActivity implements BottomNavigationBar.OnTabSelectedListener {
 private ArrayList<Fragment> fragments;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_three);
 BottomNavigationBar bottomNavigationBar = (BottomNavigationBar) findViewById(R.id.bottom_navigation_bar);
 bottomNavigationBar.setMode(BottomNavigationBar.MODE_FIXED);
 bottomNavigationBar.setBackgroundStyle(BottomNavigationBar.BACKGROUND_STYLE_STATIC);
 bottomNavigationBar.setBarBackgroundColor(R.color.bg);
 bottomNavigationBar.addItem(new BottomNavigationItem(R.drawable.home_tab_main_selector, "首页"))
 .addItem(new BottomNavigationItem(R.drawable.home_tab_assortment_selector, "分类"))
 .addItem(new BottomNavigationItem(R.drawable.home_tab_car_selector, "购物车"))
 .addItem(new BottomNavigationItem(R.drawable.home_tab_recommend_selector, "热榜"))
 .addItem(new BottomNavigationItem(R.drawable.home_tab_my_selector, "我的"))
 .setFirstSelectedPosition(0)
 .initialise();
 fragments = getFragments();
 setDefaultFragment();
 bottomNavigationBar.setTabSelectedListener(this);
 }
 
 /**
 * 设置默认的
 */
 private void setDefaultFragment() {
 FragmentManager fm = getSupportFragmentManager();
 FragmentTransaction transaction = fm.beginTransaction();
 transaction.replace(R.id.layFrame, MainFragment.newInstance("首页"));
 transaction.commit();
 }
 
 private ArrayList<Fragment> getFragments() {
 ArrayList<Fragment> fragments = new ArrayList<>();
 fragments.add(MainFragment.newInstance("首页"));
 fragments.add(AssortmentFragment.newInstance("分类"));
 fragments.add(CarFragment.newInstance("购物车"));
 fragments.add(RecommendFragment.newInstance("热榜"));
 fragments.add(MySpaceFragment.newInstance("我的"));
 return fragments;
 }
 
 @Override
 public void onTabSelected(int position) {
 if (fragments != null) {
 if (position < fragments.size()) {
 FragmentManager fm = getSupportFragmentManager();
 FragmentTransaction ft = fm.beginTransaction();
 Fragment fragment = fragments.get(position);
 if (fragment.isAdded()) {
 ft.replace(R.id.layFrame, fragment);
 } else {
 ft.add(R.id.layFrame, fragment);
 }
 ft.commitAllowingStateLoss();
 }
 }
 
 }
 
 @Override
 public void onTabUnselected(int position) {
 if (fragments != null) {
 if (position < fragments.size()) {
 FragmentManager fm = getSupportFragmentManager();
 FragmentTransaction ft = fm.beginTransaction();
 Fragment fragment = fragments.get(position);
 ft.remove(fragment);
 ft.commitAllowingStateLoss();
 }
 }
 }
 
 @Override
 public void onTabReselected(int position) {
 
 }
}

下面我们就来看一篇关于Android常用跳转工具集合汇总，希望这篇文章能够让各位了解到android中常用跳转工具用法吧。

这里包含了一些基本的并且常用的跳转工具。

这是需要的对应的权限。

<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

代码：

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
 
import java.io.File;
 
import frame.zmit.cn.publicutils.R;
 
/**
 * Created by joy on 2016/7/21.
 * 工具集合
 */
public class MainActivity extends AppCompatActivity {
 private String mImagePath;//返回的图片路径
 private final static int REQUEST_CODE_GALLERY = 0x11;
 private final static int REQUEST_CODE_CAMERA = 0x12;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 /**
 * 打开微信
 */
 findViewById(R.id.btn_open_weixin).setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 Intent intent = getPackageManager().getLaunchIntentForPackage("com.tencent.mm");
 startActivity(intent);
 }
 });
 /**
 * 跳转到QQ聊天界面
 */
 findViewById(R.id.btn_open_qq).setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 String mQqNumber = "98*****08";
 String url11 = "mqqwpa://im/chat?chat_type=wpa&uin=" + mQqNumber + "&version=10";
 startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url11)));
 }
 });
 /**
 * 跳转到联系人界面
 */
 findViewById(R.id.btn_people_interface).setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 Intent intent = new Intent();
 intent.setClassName("com.android.contacts", "com.android.contacts.activities.PeopleActivity");
 startActivity(intent);
 }
 });
 /**
 * 跳转到拨号界面
 */
 findViewById(R.id.btn_telephone_interface).setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 String phone = "157*****737";
 Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + phone));
 intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 startActivity(intent);
 }
 });
 /**
 * 直接拨打电话
 */
 findViewById(R.id.btn_telephone).setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 String phone = "157*****737";
 Intent intentPhone = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + phone));
 startActivity(intentPhone);
 }
 });
 /**
 * 跳转到短信界面
 */
 findViewById(R.id.btn_message_interface).setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 Intent intent = new Intent(Intent.ACTION_VIEW);
 intent.setType("vnd.android-dir/mms-sms");
 startActivity(intent);
 }
 });
 /**
 * 跳转到短信界面
 * 指定号码和短信内容
 */
 findViewById(R.id.btn_message).setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 String phone = "157*****737";
 String message = "这是一个自定义的内容";
 Intent intent = new Intent(Intent.ACTION_SENDTO, Uri.parse("smsto:" + phone));
 intent.putExtra("sms_body", message);
 startActivity(intent);
 }
 });
 /**
 * 跳转到设置界面
 */
 findViewById(R.id.btn_setting_interface).setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 Intent intent = new Intent(Settings.ACTION_SETTINGS);
 startActivity(intent);
 }
 });
 /**
 * 跳转到蓝牙界面
 */
 findViewById(R.id.btn_bluetooth_interface).setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 Intent intent = new Intent(Settings.ACTION_BLUETOOTH_SETTINGS);
 startActivity(intent);
 }
 });
 /**
 * 调用浏览器
 */
 findViewById(R.id.btn_browser).setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 Intent intent = new Intent();
 intent.setAction("android.intent.action.VIEW");
 Uri content_url = Uri.parse("http://www.baidu.com");
 intent.setData(content_url);
 startActivity(intent);
 }
 });
 /**
 * 打开照相机
 */
 findViewById(R.id.btn_camera).setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 mImagePath = chooseImageFromCamera(MainActivity.this, REQUEST_CODE_CAMERA, "cameraImage");
 }
 });
 /**
 * 打开相册并获取图片地址
 */
 findViewById(R.id.btn_gallery).setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 Intent intent = new Intent(Intent.ACTION_PICK, null);
 intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
 startActivityForResult(intent, REQUEST_CODE_GALLERY);
 }
 });
 }
 
 public String chooseImageFromCamera(Activity activity, int requestCode, String imageName) {
 Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
 File file = new File(Environment.getExternalStorageDirectory() + "/Images");
 if (!file.exists()) {
 file.mkdirs();
 }
 String savePath = Environment.getExternalStorageDirectory() + "/Images/" + imageName + String.valueOf(System.currentTimeMillis()) + ".jpg";
 Uri mUri = Uri.fromFile(
 new File(savePath));
 cameraIntent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mUri);
 cameraIntent.putExtra("return-data", true);
 activity.startActivityForResult(cameraIntent, requestCode);
 return savePath;
 }
 
 public String onActivityResultForChooseImageFromGallery(
 Context context, int requestCode, int resultCode, Intent data) {
 String imagePath = null;
 if (data != null) {
 if ("file".equals(data.getData().getScheme())) {
 /** 有些低版本机型返回的Uri模式为file*/
 imagePath = data.getData().getPath();
 } else {
 Uri selectedImage = data.getData();
 String[] filePathColumn = {MediaStore.Images.Media.DATA};
 
 Cursor cursor = context.getContentResolver().query(selectedImage,
 filePathColumn, null, null, null);
 cursor.moveToFirst();
 
 int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
 imagePath = cursor.getString(columnIndex);
 cursor.close();
 }
 return imagePath;
 } else {
 return null;
 }
 
 }
 
 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 super.onActivityResult(requestCode, resultCode, data);
 switch (requestCode) {
 case REQUEST_CODE_GALLERY:
 mImagePath = onActivityResultForChooseImageFromGallery(MainActivity.this,
 requestCode, resultCode, data);
 if (mImagePath != null && mImagePath.length() > 0) {
 Toast.makeText(MainActivity.this, mImagePath, Toast.LENGTH_SHORT).show();
 }
 break;
 case REQUEST_CODE_CAMERA:
 if (mImagePath != null && mImagePath.length() > 0) {
 Toast.makeText(MainActivity.this, mImagePath, Toast.LENGTH_SHORT).show();
 }
 break;
 }
 }
}

下面我们来看一篇关于android自定义View之获取文字高度例子，希望这篇文章能够对各位带来帮助。

自定义View经常会画文字，那么就可能需要获取文字的高度，这里介绍一种好用的方法:

public double getTxtHeight(Paint mPaint) {
    Paint.FontMetrics fm = mPaint.getFontMetrics();
    return Math.ceil(fm.descent - fm.ascent);
}

参数为Paint,就是你画文字的画笔,效果如下

canvas.drawText("测试文字", 300, 300, mPaint);
canvas.drawText("文字的高度为:" + getTxtHeight(mPaint) + "px", 300, 400, mPaint);

下面我们来看一篇关于android开发自定义View实现柱状图的例子，希望这篇文章能够对各位带来帮助，具体的细节步骤如下文介绍。

为了使文章中的代码看起来简洁一点，便于理解一点，我就不把Paint的实例化代码贴出来了，另外提示:本文所有变量都是我定死的，各位可以根据需求来自己设置getset方法.

参数:

private Paint mPaint;//画文字和XY轴的画笔
private Paint mPaintColumn;//画圆柱的画笔
private final float START_X = 200;//Y轴左上角X坐标
private final float START_Y = 200;//Y轴左上角Y坐标
private boolean canLoad = true;//是否开始画图
private float XSpace = 150;//Y轴每个数字间距
private float XWidth = 900;//X轴总长度
private String[] XNames = {"测试1", "测试2", "测试3", "测试4", "测试5"};
private int YCount = 10;//Y轴数值的个数(包括0)
private float YSpace = 100;//Y轴每个数字间距
private float YHeight = 1000;//Y轴总长度
private float ColumsWidth = 50;//长方形宽(圆柱)

YHeight = (float) (YHeight + getTxtHeight(mPaint));//这个代码的意思是:将Y轴的值和文字高度加起来,因为文字有高度,如果
不算文字高度,最后一个Y轴的值就会比计划高一点

//获取文字的高
public double getTxtHeight(Paint mPaint) {
 Paint.FontMetrics fm = mPaint.getFontMetrics();
 return Math.ceil(fm.descent - fm.ascent);
}

关键代码draw:

@Override
public void draw(Canvas canvas) {
    super.draw(canvas);
    if (canLoad) {
        canvas.drawLine(START_X, START_Y, START_X, YHeight + START_Y, mPaint);//Y轴
        canvas.drawLine(START_X, YHeight + START_Y, START_X + XWidth, YHeight + START_Y, mPaint);//X轴
        float MaxTextWidth = mPaint.measureText("1000");//这里我知道最长的字为1000,所以这么写,根据不同情况改
        float TxtHeight = (float) getTxtHeight(mPaint);//mPaint所画文字的高度
        //Y轴上的数值
        for (int i = 0; i <= YCount; i++) {
            String count = 100 * i + "";
            canvas.drawText(count, START_X - MaxTextWidth, YHeight + START_Y - YSpace * i, mPaint);
        }
        //X轴上的数值
        for (int i = 0; i < XNames.length; i++) {
            String name = XNames[i];
            canvas.drawText(name, START_X + XSpace * (i + 1), YHeight + START_Y + TxtHeight, mPaint);
        }
 
        //圆柱和圆柱上面的具体数值
        for (int i = 0; i < XNames.length; i++) {
            String count = (i + 1) * 100 + "";
            canvas.drawRect(START_X + XSpace * (i + 1) - ColumsWidth / 2, START_Y + YHeight - (i + 1) * YSpace, START_X + XSpace * (i + 1) + ColumsWidth / 2, YHeight + START_Y, mPaintColumn);
            canvas.drawText(count, ColumsWidth/2+START_X + XSpace * (i + 1) - ColumsWidth / 2, START_Y + YHeight - (i + 1) * YSpace-10, mPaint);
        }
 
    }
}