1、获取标题栏的高度

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

      int contentTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT)
          .getTop();
      int titleBarHeight = contentTop - statusBarHeight;
      textView.setText("statusBarHeight" + statusBarHeight + ";contentTop="
          + contentTop + ";titleBarHeight" + titleBarHeight);


2、以Acivity作为布局

注：该类必须继承ActivityGroup

LocalActivityManager activityManager;
activityManager = getLocalActivityManager();
View view2 = activityManager.startActivity("act2",new Intent(this, Act2.class)).getDecorView();
linearLayout.addView(view2, new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));


3、屏幕截图并保存

View view = getWindow().getDecorView();
    Bitmap bitmap = Bitmap.createBitmap(view.getWidth(),
    view.getHeight(), Config.RGB_565);  
                view.draw(new Canvas(bitmap));
                imageView.setImageBitmap(bitmap);


4、android 获取组件尺寸大小

在oncreate()中利用view.getWidth()或是view.getHeiht()来获取view的宽和高。看似没有问题。事实上他们去得值是0。并非你想要的结果？

这是为什么呢？

在调用oncreate()方法时，界面处于不可见状态，内存载入​​组件​​还没有绘制出来，你是无法获取他的尺寸。

那怎样在绘制组件之前能获取到该组件的尺寸大小呢？

这里有三种方法，经过验证的：

（1）




int width =View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED); 
int height =View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED); 
view.measure(width,height); 
int height=view.getMeasuredHeight(); 
int width=view.getMeasuredWidth();


（2）


//添加组件绘制之前的监听
ViewTreeObserver vto =view.getViewTreeObserver(); 
vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() { 
   @Override
    public booleanonPreDraw() { 
       int height =view.getMeasuredHeight(); 
       int width =view.getMeasuredWidth();     
   } 
});

（3）


//添加总体布局监听
ViewTreeObserver vto = view.getViewTreeObserver();  
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener(){ 
    @Override 
    public voidonGlobalLayout() { 
      view.getViewTreeObserver().removeGlobalOnLayoutListener(this);      
    int height =view.getMeasuredHeight(); 
     int width =view.getMeasuredWidth();  
    }  
});

那么。在activity进入执行期时，组件的尺寸获取方法就非常easy了。直接getWidth()和getHeight().


4、安卓线程池发请求工具类


作用：该类控制程序的请求发送 



public class ThreadPoolUtils {

  private ThreadPoolUtils() {
  }

  // 定义核心线程数。并行线程数
  private static int CORE_POOL_SIZE = 3;

  // 线程池最大线程数：除了正在执行的线程额外保存多少个线程
  private static int MAX_POOL_SIZE = 200;

  // 额外线程空暇状态生存时间
  private static int KEEP_ALIVE_TIME = 5000;

  // 堵塞队列。当核心线程队列满了放入的
  // 初始化一个大小为10的泛型为Runnable的队列
  private static BlockingQueue<Runnable> workQueue = new ArrayBlockingQueue<Runnable>(
      10);
  // 线程工厂,把传递进来的runnable对象生成一个Thread
  private static ThreadFactory threadFactory = new ThreadFactory() {

    // 原子型的integer变量生成的integer值不会反复
    private final AtomicInteger ineger = new AtomicInteger();

    @Override
    public Thread newThread(Runnable arg0) {
      return new Thread(arg0, "MyThreadPool thread:"
          + ineger.getAndIncrement());
    }
  };

  // 当线程池发生异常的时候回调进入
  private static RejectedExecutionHandler handler = new RejectedExecutionHandler() {
    @Override
    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
      // 进行重新启动操作
    }

  };
  // 线程池ThreadPoolExecutor java自带的线程池
  private static ThreadPoolExecutor threadpool;
  // 静态代码块，在类被载入的时候进入
  static {
    threadpool = new ThreadPoolExecutor(CORE_POOL_SIZE, MAX_POOL_SIZE,
        KEEP_ALIVE_TIME, TimeUnit.SECONDS, workQueue, threadFactory,
        handler);
  }

  public static void execute(Runnable runnable) {
    threadpool.execute(runnable);
  }
}


4、动态加入ProgressBar


注意：调用setProgress方法的时候推断假设没有在主线程，会封装一个runnabe然后post到主线程


因此可有看成是在子线程去刷新了组件



progressBar = new ProgressBar(getApplicationContext(), null,
        android.R.attr.progressBarStyleHorizontal);
    progressBar.setMax(100);
    // progressBar.setIndeterminate(false);
    // progressBar.setProgressDrawable(getResources().getDrawable(
    // android.R.drawable.progress_horizontal));
    // progressBar.setIndeterminateDrawable(getResources().getDrawable(
    // android.R.drawable.progress_indeterminate_horizontal));
    LayoutParams layoutParams2 = new LayoutParams(LayoutParams.FILL_PARENT,
        LayoutParams.WRAP_CONTENT);
    progressBar.setLayoutParams(layoutParams2);
    progressBar.setPadding(5, 5, 5, 5);
    runBarLayout.addView(progressBar);

5、抽屉布局的使用



使用抽屉的效果和滑动菜单的差别是，抽屉布局如其如，抽出来后会覆盖以下的布局，而滑动菜单则不会覆盖，而是使其右移。


方法： 



<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ABCDFF"
    tools:context="com.example.drawtest.MainActivity" >

    <FrameLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#ABFFFF" >

        <Button
            android:id="@+id/button1"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button" />
    </FrameLayout>

    <fragment
        android:id="@+id/navigation_drawer"
        android:name="com.drawer.test.LeftMenuFrag"
        android:layout_width="200dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        tools:layout="@layout/leftmenu" />

</android.support.v4.widget.DrawerLayout>