Android悬浮窗示例（floatingwindow）

【实例截图】

【核心代码】

package dongzhong.testforfloatingwindow;

import android.content.Intent;
import android.net.Uri;
import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == 0) {
            if (!Settings.canDrawOverlays(this)) {
                Toast.makeText(this, "授权失败", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "授权成功", Toast.LENGTH_SHORT).show();
                startService(new Intent(MainActivity.this, FloatingButtonService.class));
            }
        } else if (requestCode == 1) {
            if (!Settings.canDrawOverlays(this)) {
                Toast.makeText(this, "授权失败", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "授权成功", Toast.LENGTH_SHORT).show();
                startService(new Intent(MainActivity.this, FloatingImageDisplayService.class));
            }
        } else if (requestCode == 2) {
            if (!Settings.canDrawOverlays(this)) {
                Toast.makeText(this, "授权失败", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "授权成功", Toast.LENGTH_SHORT).show();
                startService(new Intent(MainActivity.this, FloatingVideoService.class));
            }
        }
    }

    public void startFloatingButtonService(View view) {
        if (FloatingButtonService.isStarted) {
            return;
        }
        if (!Settings.canDrawOverlays(this)) {
            Toast.makeText(this, "当前无权限，请授权", Toast.LENGTH_SHORT);
            startActivityForResult(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:"   getPackageName())), 0);
        } else {
            startService(new Intent(MainActivity.this, FloatingButtonService.class));
        }
    }

    public void startFloatingImageDisplayService(View view) {
        if (FloatingImageDisplayService.isStarted) {
            return;
        }
        if (!Settings.canDrawOverlays(this)) {
            Toast.makeText(this, "当前无权限，请授权", Toast.LENGTH_SHORT);
            startActivityForResult(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:"   getPackageName())), 1);
        } else {
            startService(new Intent(MainActivity.this, FloatingImageDisplayService.class));
        }
    }

    public void startFloatingVideoService(View view) {
        if (FloatingVideoService.isStarted) {
            return;
        }
        if (!Settings.canDrawOverlays(this)) {
            Toast.makeText(this, "当前无权限，请授权", Toast.LENGTH_SHORT);
            startActivityForResult(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:"   getPackageName())), 2);
        } else {
            startService(new Intent(MainActivity.this, FloatingVideoService.class));
        }
    }
}