Test

	private static final String LOG_TAG = "SlideActivity";
	/** android.R.id.content 这个View */
	private View mContentView = null;
	/** 一个activity的主View */
	private View mDecoreView = null;
	//记录滑动的开始的位置
	private int mDownPos = -1;
	//记录滑动手指的id
	private int mPointerId = -1;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		//这里，请注意，需要把windowbackground设置为透明，并且android:windowIsTranslucent置为true.
		//这样，你才会在滑动的时候，看到下面Activity的界面。请参看AndroidManifest.xml这个Activity的style.
		//而且，在开发的过程中，发现windowbackgournd设置为@null的,滑动会花屏，这个原因还没有找到。
		this.setContentView(R.layout.slide_activity);
		getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
		Log.i(LOG_TAG, "onCreate");
	}

	@Override
	protected void onStart() {
		super.onStart();
		Log.i(LOG_TAG, "onStart");
	}

	@Override
	protected void onRestart() {
		super.onRestart();
		Log.i(LOG_TAG, "onRestart");
	}
	@Override
	protected void onResume() {
		super.onResume();
		//拿到decoreView
		mDecoreView = this.getWindow().getDecorView();
		//拿到contentView
		mContentView = mDecoreView.findViewById(android.R.id.content);
		//监听contentView上面的Touch事件
		mContentView.setOnTouchListener(new OnTouchListener(){

			@Override
			public boolean onTouch(View v, MotionEvent event) {
				Log.i(LOG_TAG, "result:" + event.getActionMasked());
				switch (event.getActionMasked()) {
				case MotionEvent.ACTION_DOWN: {
					//分配记录滑动的初始位置，和PointerId。
					mDownPos = (int) event.getRawY();
					mPointerId = event.getPointerId(event.getActionIndex());
					Log.e(LOG_TAG, "mDownPos:" + event.getY());
					break;
				}
				case MotionEvent.ACTION_MOVE: {
					//滑动contentView 到  手指当前位置到初始位置的位移。
					int currentPos = (int) event.getRawY();
					v.scrollTo(0, mDownPos - currentPos);
					v.invalidate();
					// use margin
					// FrameLayout.LayoutParams flp =
					// (FrameLayout.LayoutParams)mContentView.getLayoutParams();
					// flp.bottomMargin = flp.bottomMargin - distance;
					// flp.topMargin = flp.topMargin + distance;
					// flp.height = mHeight - (mDownPos - currentPos);
					// mContentView.offsetTopAndBottom(-distance);
					// mContentView.setLayoutParams(flp);
					// mDecoreView.invalidate();

					// move windows?
					// WindowManager.LayoutParams wlp = mWindow.getAttributes();
					// wlp.y = currentPos - mDownPos;
					// mWindow.setAttributes(wlp);

					//
					// WindowManager.LayoutParams wlp =
					// (WindowManager.LayoutParams)mDecoreView.getLayoutParams();
					// Log.i(LOG_TAG, "posX:"+ wlp.x + " posY:"+wlp.y);
					// wlp.y = currentPos - mDownPos;
					// //wlp.height = mHeight;
					// Log.i(LOG_TAG, "posY change to "+wlp.y);
					// //wlp.height = 360;
					// this.getWindowManager().updateViewLayout(mDecoreView,
					// wlp);
					break;
				}
				case MotionEvent.ACTION_POINTER_DOWN:
				case MotionEvent.ACTION_POINTER_UP:
				case MotionEvent.ACTION_CANCEL:
				case MotionEvent.ACTION_UP:
				default: {
					int pointerId = event.getPointerId(event.getActionIndex());
					//如果是触发Action_Down的手指出现UP或Cancel事件。计算总位移并决定是不是需要关闭这个Activity
					if(-1 != pointerId && mPointerId == pointerId) {
						int currentPosY = (int)event.getY(event.findPointerIndex(mPointerId));
						int distance = mDownPos - currentPosY;
						int height = v.getHeight();
						
						if(distance <= -height/2) {
							//滑动超过半屏，结束Activity。
							v.scrollTo(0, -height);
							v.invalidate();
							SlideActivity.this.finish();
						} else if (distance > -height/2 && distance < height/2) {
							//滑动位置没超过半个屏幕，恢复初始位置
							v.scrollTo(0, 0);
							v.invalidate();
						} else {
							//滑动超过半屏，结束Activity。
							v.scrollTo(0, height);
							v.invalidate();
							SlideActivity.this.finish();
						}
						//清除变量
						mPointerId = -1;
					}
				}
				}
				return true;
			}
		});
		Log.i(LOG_TAG, "onResume");
	}

	@Override
	protected void onPause() {
		super.onPause();
		Log.i(LOG_TAG, "onPause");
	}

	@Override
	protected void onStop() {
		super.onStop();
		Log.i(LOG_TAG, "onStop");
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
		Log.i(LOG_TAG, "onDestroy");
	}
}