android设置全屏与取消全屏方法

    package com.hhh.changeimage；
    import android.app.Activity;
    import android.os.Bundle;
    import android.view.Window;
    import android.view.WindowManager;
    public class ChangeImage extends Activity
    {
    public void onCreate(Bundle savedInstanceState)
    {
    super.onCreate(savedInstanceState);
    //无title
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams. FLAG_FULLSCREEN);
    setContentView(R.layout.main);
    }
    }

    <activity android:name=".ChangeImage"
    android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
    android:label="@string/app_name">
    <intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
    </activity>

xml version="1.0" encoding="utf-8"?>

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

   android:layout_width="fill_parent"

   android:layout_height="fill_parent"

   android:orientation="horizontal">

<<>ImageButton

       android:id="@+id/imageButton1"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content"

       android:layout_alignParentLeft="true"

       android:layout_centerVertical="true"

       android:background="#00000000"

       android:src="@drawable/prv"/>

<<>TextView

       android:layout_width="wrap_content"

       android:layout_height="wrap_content"

       android:layout_centerInParent="true"

       android:text="标题栏"/>

<<>ImageButton

       android:id="@+id/imageButton1"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content"

       android:layout_alignParentRight="true"

       android:layout_centerInParent="true"

       android:background="#00000000"

       android:src="@drawable/next"/>
<RelativeLayout>

name="CustomWindowTitleBackground">

name="android:background">#00cc00

name="test"parent="android:Theme">

name="android:windowTitleSize">50dp

name="android:windowTitleBackgroundStyle">@style/CustomWindowTitleBackground

android:name=".CustomTitileBarActivity"
android:label="@string/app_name"android:theme="@style/test">
android:name="android.intent.action.MAIN"/>
 android:name="android.intent.category.LAUNCHER"/>

android:gravity="center"是对textView中文字居中

android:layout_gravity="center"是对textview控件在整个布局中居中

<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:textSize="40sp"
    android:gravity="center_vertical|left"
    android:text="@string/hello_world" />

android:focusable="true"
android:focusableInTouchMode="true"

<LinearLayout
style="@style/FillWrapWidgetStyle"
android:orientation="vertical"
android:background="@color/black"
android:gravity="center_horizontal"
android:focusable="true"
android:focusableInTouchMode="true"
>
<ImageView
android:id="@+id/logo"
style="@style/WrapContentWidgetStyle"
android:background="@drawable/dream_dictionary_logo"
/>
<RelativeLayout
style="@style/FillWrapWidgetStyle"
android:background="@drawable/searchbar_bg"
android:gravity="center_vertical"
>
<EditText
android:id="@+id/searchEditText"
style="@style/WrapContentWidgetStyle"
android:background="@null"
android:hint="Search"
android:layout_marginLeft="40dp"
android:singleLine="true"
/>
</RelativeLayout>
</LinearLayout>

<LinearLayout
    android:id="@+id/linearLayout_focus"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:layout_width="0px"
    android:layout_height="0px"/>

@Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
 
  if(requestCode == CAMERA && resultCode == Activity.RESULT_OK && null != data){
   String sdState=Environment.getExternalStorageState();
   if(!sdState.equals(Environment.MEDIA_MOUNTED)){
    GameLog.log(Tag, "sd card unmount");
    return;
   }
   new DateFormat();
   String name= DateFormat.format("yyyyMMdd_hhmmss", Calendar.getInstance(Locale.CHINA))+".jpg";
   Bundle bundle = data.getExtras();
   //获取相机返回的数据，并转换为图片格式
   Bitmap bitmap = (Bitmap)bundle.get("data");
   FileOutputStream fout = null;
   File file = new File("/sdcard/pintu/");
   file.mkdirs();
   String filename=file.getPath()+name;
   try {
    fout = new FileOutputStream(filename);
    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fout);
   } catch (FileNotFoundException e) {
    e.printStackTrace();
   }finally{
    try {
     fout.flush();
     fout.close();
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
   //显示图片
  
  }

}

@Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
 
  if(requestCode == CAMERA && resultCode == Activity.RESULT_OK && null != data){
 

   Uri selectedImage = data.getData();
   String[] filePathColumns={MediaStore.Images.Media.DATA};
   Cursor c = this.getContentResolver().query(selectedImage, filePathColumns, null,null, null);
   c.moveToFirst();
   int columnIndex = c.getColumnIndex(filePathColumns[0]);
   String picturePath= c.getString(columnIndex);
   c.close();
   //获取图片并显示

  
  }

 /**
             * Insert an image and create a thumbnail for it.
             *
             * @param cr The content resolver to use
             * @param source The stream to use for the image
             * @param title The name of the image
             * @param description The description of the image
             * @return The URL to the newly created image, or <code>null</code> if the image failed to be stored
             *              for any reason.
             */
            public static final String insertImage(ContentResolver cr, Bitmap source,
                                                   String title, String description) {
                ContentValues values = new ContentValues();
                values.put(Images.Media.TITLE, title);
                values.put(Images.Media.DESCRIPTION, description);
                values.put(Images.Media.MIME_TYPE, "image/jpeg");

                Uri url = null;
                String stringUrl = null;    /* value to be returned */

                try {
                    url = cr.insert(EXTERNAL_CONTENT_URI, values);

                    if (source != null) {
                        OutputStream imageOut = cr.openOutputStream(url);
                        try {
                            source.compress(Bitmap.CompressFormat.JPEG, 50, imageOut);
                        } finally {
                            imageOut.close();
                        }

                        long id = ContentUris.parseId(url);
                        // Wait until MINI_KIND thumbnail is generated.
                        Bitmap miniThumb = Images.Thumbnails.getThumbnail(cr, id,
                                Images.Thumbnails.MINI_KIND, null);
                        // This is for backward compatibility.
                        Bitmap microThumb = StoreThumbnail(cr, miniThumb, id, 50F, 50F,
                                Images.Thumbnails.MICRO_KIND);
                    } else {
                        Log.e(TAG, "Failed to create thumbnail, removing original");
                        cr.delete(url, null, null);
                        url = null;
                    }
                } catch (Exception e) {
                    Log.e(TAG, "Failed to insert image", e);
                    if (url != null) {
                        cr.delete(url, null, null);
                        url = null;
                    }
                }

                if (url != null) {
                    stringUrl = url.toString();
                }

                return stringUrl;
            }

   /**
             * Insert an image and create a thumbnail for it.
             *
             * @param cr The content resolver to use
             * @param imagePath The path to the image to insert
             * @param name The name of the image
             * @param description The description of the image
             * @return The URL to the newly created image
             * @throws FileNotFoundException
             */
            public static final String insertImage(ContentResolver cr, String imagePath,
                    String name, String description) throws FileNotFoundException {
                // Check if file exists with a FileInputStream
                FileInputStream stream = new FileInputStream(imagePath);
                try {
                    Bitmap bm = BitmapFactory.decodeFile(imagePath);
                    String ret = insertImage(cr, bm, name, description);
                    bm.recycle();
                    return ret;
                } finally {
                    try {
                        stream.close();
                    } catch (IOException e) {
                    }
                }
            }

sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory()))); 

Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);  
 Uri uri = Uri.fromFile(new File("/sdcard/image.jpg"));  
 intent.setData(uri);  
 mContext.sendBroadcast(intent); 

final MediaScannerConnection msc = new MediaScannerConnection(mContext, new MediaScannerConnectionClient() {  
  public void onMediaScannerConnected() {  
   msc.scanFile("/sdcard/image.jpg", "image/jpeg");  
  }  
  public void onScanCompleted(String path, Uri uri) {  
   Log.v(TAG, "scan completed");  
   msc.disconnect();  
  }  
 });  

private  String getFilePathByContentResolver(Context context, Uri uri) {
  if (null == uri) {
   return null;
  }
        Cursor c = context.getContentResolver().query(uri, null, null, null, null);
        String filePath  = null;
        if (null == c) {
            throw new IllegalArgumentException(
                    "Query on " + uri + " returns null result.");
        }
        try {
            if ((c.getCount() != 1) || !c.moveToFirst()) {
            } else {
             filePath = c.getString(
               c.getColumnIndexOrThrow(MediaColumns.DATA));
            }
        } finally {
            c.close();
        }
        return filePath;
    }