WindowManager之实现类似360桌面悬浮物

直接上代码



public class WindowMangerTestActivityaa extends Activity {

float rawX;

float rawY;

float xx = 0.0f;

float yy = 0.0f;

WindowManager manager;

WindowManager.LayoutParams params;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

// setContentView(R.layout.main);

final TextView tv = new TextView(this);

manager = (WindowManager) getApplicationContext().getSystemService(

Context.WINDOW_SERVICE);

params = new WindowManager.LayoutParams();

params.x = 0;

params.y = 0;

tv.setBackgroundColor(Color.WHITE);

tv.setTextColor(Color.BLACK);

tv.setText("adfasdfsdf");

params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE

| WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;

params.alpha = 0.5f;

params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT

| WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY;

params.format = 1;

params.gravity = Gravity.LEFT| Gravity.TOP;

params.height = 80;

params.width = 80;

manager.addView(tv, params);

tv.setOnTouchListener(new OnTouchListener() {

@Override

public boolean onTouch(View v, MotionEvent event) {

rawX = event.getRawX();

rawY = event.getRawY();

int action = event.getAction();

switch (action) {

case MotionEvent.ACTION_DOWN:

xx = event.getX();

yy = event.getY();

break;

case MotionEvent.ACTION_MOVE:

params.x = (int) (rawX - xx);

params.y = (int) (rawY - yy);

manager.updateViewLayout(tv, params);

break;

default:

break;

}

// TODO Auto-generated method stub

return true;

}

});

}

}

请注意

1.getSystemService之前的那个getApplicationContext是必须的，一般情况下，大家可能会运用this（我也是），用了this之后导致，textview只能在当前的activity上显示，返回之后textview消失

2.params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE

| WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;否则textview是拖不动的。

3.在AndroidManifest.xml中添加权限<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>

4.在AndroidManifest.xml中的Activity节点属性中添加android:theme="@android:style/Theme.NoDisplay"