Android 坐标系与视图坐标系图解分析

  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical">

  <TextView

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:text="Please input:"/>

  <AutoCompleteTextView

    android:id="@+id/actv"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"/>

importandroid.app.Activity;

importandroid.os.Bundle;

importandroid.text.Editable;

importandroid.text.Selection;

importandroid.text.TextWatcher;

importandroid.view.View;

importandroid.widget.AdapterView;

importandroid.widget.AdapterView.OnItemClickListener;

importandroid.widget.ArrayAdapter;

importandroid.widget.AutoCompleteTextView;

importandroid.widget.EditText;

importandroid.widget.TextView;

importandroid.widget.Toast;

publicclassMainActivityextendsActivity {

privateAutoCompleteTextView mAutoCompleteTextView;

privateString[] mAutoStrs =newString[] {"138 0013 8000","13800138001",

        "13800138002","13800138003","13800138004","138 0013 800清除记录"};

privateString mBeforeTextChangedStr ="";

publicvoidonCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.activity_main);

  mAutoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.actv);

  ArrayAdapter_arrayAdapter =newArrayAdapter(this,

                android.R.layout.simple_dropdown_item_1line, mAutoStrs);

  mAutoCompleteTextView.setAdapter(_arrayAdapter);

  mAutoCompleteTextView.setThreshold(1);// 设置输入一个字符就提示

  mAutoCompleteTextView.setOnItemClickListener(newOnItemClickListener() {

     @Override

     publicvoidonItemClick(AdapterView arg0, View arg1,intarg2,

               longarg3) {

        String _clearStr ="";

        if(arg1instanceofTextView) {

          _clearStr = ((TextView) arg1).getText().toString();

         }

        if(_clearStr.equals("138 0013 800清楚记录")) {

          mAutoCompleteTextView.setText(mBeforeTextChangedStr);

          Editable _editable = mAutoCompleteTextView.getText();

          Selection.setSelection(_editable, _editable.length());

          Toast.makeText(MainActivity.this,"清除成功了!",

          Toast.LENGTH_LONG).show();

        }

    }

  });

  phoneNumAddSpaceOne(mAutoCompleteTextView);

}

/**

* 手机号格式化代码

*

* @param editText

* EditText对象

*/

publicvoidphoneNumAddSpaceOne(finalEditText editText) {

  editText.addTextChangedListener(newTextWatcher() {

    privateintstart;

    privateintbefore;

    privateStringBuilder stringBuilder;

    @Override

    publicvoidonTextChanged(CharSequence s,intstart,intbefore,

                 intcount) {

      this.start = start;

      this.before = before;

    }

    @Override

    publicvoidbeforeTextChanged(CharSequence s,intstart,intcount,

      intafter) {

    }

    @Override

    publicvoidafterTextChanged(Editable s) {

      String _str = s.toString();

      if(!isNumeric(_str.replace(" ",""))) {

        return;

      }

      mBeforeTextChangedStr = _str;

      // 手机号格式化xxx xxxx xxxx

      if(s ==null|| s.length() ==0)

        return;

      if(stringBuilder ==null) {

        stringBuilder =newStringBuilder();

      }else{

        stringBuilder.delete(0, stringBuilder.length());

      }

      for(inti =0; i < s.length(); i++) {

      if(i !=3&& i !=8&& s.charAt(i) ==' ') {

        continue;

      }else{

        stringBuilder.append(s.charAt(i));

      if((stringBuilder.length() ==4|| stringBuilder

        .length() ==9)&& stringBuilder.charAt(stringBuilder.length() -1) !=' ') {

      stringBuilder.insert(stringBuilder.length() -1,' ');

      }

    }

  }

  if(!stringBuilder.toString().equals(s.toString())) {

    intindex = start +1;

   if(stringBuilder.charAt(start) ==' ') {

  if(before ==0) {

    index++;

  }else{

    index--;

  }

}else{

  if(before ==1) {

    index--;

  }

}

  editText.setText(stringBuilder.toString());

  editText.setSelection(index);

}

}

});

}

/**

* 判断字符串是否是数字

*

* @param str

* 需要判断的字符串

* @return

*/

publicbooleanisNumeric(String str) {

  for(inti = str.length(); --i >=0;) {

    intchr = str.charAt(i);

    if(chr<48|| chr="">57)

    returnfalse;

    }

    returntrue;

  }

}

packagecom.example.androidtest;

importjava.util.Locale;

importandroid.os.Bundle;

importandroid.app.Activity;

importandroid.content.Intent;

importandroid.content.res.Configuration;

importandroid.content.res.Resources;

importandroid.util.DisplayMetrics;

importandroid.view.Menu;

importandroid.view.View;

importandroid.widget.Button;

publicclassMainActivityextendsActivity {

    @Override

    protectedvoidonCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Button btnLang = (Button) findViewById(R.id.btn);

        // 按下按钮改变语言类型，在“简体中文”和“英文”之间切换

        btnLang.setOnClickListener(newView.OnClickListener() {

            @Override

            publicvoidonClick(View v) {

                // 获取当前Locale（包含语言信息）

                Locale curLocale = getResources().getConfiguration().locale;

                // 判断语言类型，有以下两种判断方式

                // 方法一，通过Locale的equals方法

                // public boolean equals (Object object)

                //   Returns true if object is a locale with the same language, country and variant.

                if(curLocale.equals(Locale.SIMPLIFIED_CHINESE)) {

                    setLang(Locale.ENGLISH);

                }else{

                    setLang(Locale.SIMPLIFIED_CHINESE);

                }

                // 方法二，通过语言码，getLanguage()方法可以获得对应语言码

                // public String getLanguage ()

                //  Returns the language code for this Locale or the empty string if no language was set.

//              if (curLocale.getLanguage().equals(Locale.SIMPLIFIED_CHINESE.getLanguage())) {

//                  setLang(Locale.ENGLISH);

//              } else {

//                  setLang(Locale.SIMPLIFIED_CHINESE);

//              }

            }

        });

    }

    privatevoidsetLang(Locale l) {

        // 获得res资源对象

        Resources resources = getResources();

        // 获得设置对象

        Configuration config = resources.getConfiguration();

        // 获得屏幕参数：主要是分辨率，像素等。

        DisplayMetrics dm = resources.getDisplayMetrics();

        // 语言

        config.locale = l;

        resources.updateConfiguration(config, dm);

        // 刷新activity才能马上奏效

        startActivity(newIntent().setClass(MainActivity.this,

            MainActivity.class));

        MainActivity.this.finish();

    }

    @Override

    publicbooleanonCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.activity_main, menu);

        returntrue;

    }

}