WindowManager

WindowManager

【好奇驱动学习】

源码接口

package android.view;

/** Interface to let you add and remove child views to an Activity. To get an instance
  * of this class, call {@link android.content.Context#getSystemService(java.lang.String) Context.getSystemService()}.
  */
public interface ViewManager
{
    /**
     * Assign the passed LayoutParams to the passed View and add the view to the window.
     * <p>Throws {@link android.view.WindowManager.BadTokenException} for certain programming
     * errors, such as adding a second view to a window without removing the first view.
     * <p>Throws {@link android.view.WindowManager.InvalidDisplayException} if the window is on a
     * secondary {@link Display} and the specified display can't be found
     * (see {@link android.app.Presentation}).
     * @param view The view to be added to this window.
     * @param params The LayoutParams to assign to view.
     */
    public void addView(View view, ViewGroup.LayoutParams params);
    public void updateViewLayout(View view, ViewGroup.LayoutParams params);
    public void removeView(View view);
}

/**
 * The interface that apps use to talk to the window manager.
 * </p><p>
 * Each window manager instance is bound to a particular {@link Display}.
 * To obtain a {@link WindowManager} for a different display, use
 * {@link Context#createDisplayContext} to obtain a {@link Context} for that
 * display, then use <code>Context.getSystemService(Context.WINDOW_SERVICE)</code>
 * to get the WindowManager.
 * </p><p>
 * The simplest way to show a window on another display is to create a
 * {@link Presentation}.  The presentation will automatically obtain a
 * {@link WindowManager} and {@link Context} for that display.
 * </p>
 */
@SystemService(Context.WINDOW_SERVICE)
public interface WindowManager extends ViewManager {
    ....
}

我的demo使用

public class MainActivity extends AppCompatActivity implements OnClickListener {
    private WindowManager mWindowManager;
    private View mView;
    
    @SuppressLint("MissingInflatedId")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mView = LayoutInflater.from(this).inflate(R.layout.mylayout, null);
        mWindowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        WindowManager.LayoutParams params = new WindowManager.LayoutParams();
        // 可以对params进行一些设置
        params.gravity = Gravity.CENTER;
        params.width = 1280;
        params.height = 720;
        params.format = PixelFormat.TRANSPARENT;
        mWindowManager.addView(mView, params);

    }
    @Override
    public void onClick(View v) {
       ....
    }


}