屏幕处理

http://www.jb51.net/article/104485.htm
一、获得屏幕高度和宽度
1、

   WindowManager wm = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
   int width = wm.getDefaultDisplay().getWidth();
   int height = wm.getDefaultDisplay().getHeight();

2、

   WindowManager wm = this.getWindowManager();
   int width = wm.getDefaultDisplay().getWidth();
   int height = wm.getDefaultDisplay().getHeight();

3、

//DisplayMetrics mDisplayMetrics= getResources().getDisplayMetrics();
DisplayMetrics mDisplayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(mDisplayMetrics);
density  = mDisplayMetrics.density;
densityDPI = mDisplayMetrics.densityDpi;
xdpi = mDisplayMetrics.xdpi;
ydpi = mDisplayMetrics.ydpi;
int W = mDisplayMetrics.widthPixels;
int H = mDisplayMetrics.heightPixels;
Log.i("Main", "Width = " + W);
Log.i("Main", "Height = " + H);

二.获取状态栏高度：

Rect frame = new Rect();
getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top; 

三.获取标题栏高度：

int contentTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();

//statusBarHeight是上面所求的状态栏的高度
int titleBarHeight = contentTop - statusBarHeight  

四、 导航栏

//requestWindowFeature(Window.FEATURE_NO_TITLE);

//设置标题
getSupportActionBar().setTitle("listView");

//设置标题不显示
getSupportActionBar().setDisplayShowTitleEnabled(false);

 // 给左上角图标的左边加上一个返回的图标,其id为：android.R.id.home
getSupportActionBar().setDisplayHomeAsUpEnabled(true);

//隐藏 actionBar
this.getSupportActionBar().hide();

注： 把 requestWindowFeature(Window.FEATURE_NO_TITLE);放在super.onCreate(savedInstanceState);前面就可以隐藏ActionBar而不报错。

五、隐藏状态栏

this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);



//隐藏状态栏
View decorView = getWindow().getDecorView();
//第一种   
//decorView.setSystemUiVisibility(View.INVISIBLE);//gone无效，invisible有效
//第二种
decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN);

六、去掉所有Activity界面的标题栏
　　修改AndroidManifest.xml
　　在application 标签中添加android:theme="@android:style/Theme.NoTitleBar"

**七、去掉所有Activity界面的TitleBar 和StatusBar **
　　修改AndroidManifest.xml
　　在application 标签中添加
　　android:theme="@android:style/Theme.NoTitleBar.Fullscreen"

八、屏幕设置

//设置为全屏

requestWindowFeature(Window.FEATURE_NO_TITLE);  
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN , WindowManager.LayoutParams.FLAG_FULLSCREEN);

//设置横屏模式

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 

或在Activity中添加：

android:screenOrientation="landscape" 

//设置竖屏模式

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

或在Activity中添加：

android:screenOrientation="portrait"