(安卓)如何获取SmartPhone ScreenWidth和Height？

Question

我正在为安卓制作游戏，并使用SurfaceView。

我想知道SmartPhone屏幕信息(高度、宽度等)。

我用了这段代码，但是..显示宽度和高度值不正确，

它总是被红色打印成"0“

我错过了什么？

public class MainActivity extends Activity {
private int width;
private int height;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    DisplayMetrics metrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(metrics);
    width = metrics.widthPixels;
    height = metrics.heightPixels;

    setContentView(new GameView(this));
}

public class Painter extends Thread
public void run(){
    Canvas canvas = null;
    long start, end;
    int sleep;
     while(true) {
         if (runnable) {
             start = System.currentTimeMillis();

             try {
                 canvas = holder.lockCanvas(null);
                 paint.setColor(Color.RED);
                 paint.setTextSize(200);

                 synchronized (holder) {
                     canvas.drawText(Integer.toString(main.getHeight()), 600, 800, paint);
                     canvas.drawText(Integer.toString(main.getWidth()), 300, 400, paint);
                 }
             } catch (Exception e) {
                 e.printStackTrace();
             } finally {
                 holder.unlockCanvasAndPost(canvas);
             }

             end = System.currentTimeMillis();

             sleep = 1000 / FPS - (int) (end - start);
             try {
                 Thread.sleep(sleep > 0 ? sleep : 0);
             } // Try
             catch (InterruptedException e) {
                 e.printStackTrace();
             }
         }
     }

Answer 1

您可以使用以下代码获取它：

DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int height = displaymetrics.heightPixels;
int width = displaymetrics.widthPixels;

适用于所有API版本，因此不需要API检查。如果您在视图中，则可能需要获取上下文：

((Activity) getContext()).getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);‌​

Answer 2

您可以使用以下代码获取显示高度和宽度。

 Display display = getWindowManager().getDefaultDisplay();
 Point size = new Point();
 display.getSize(size);
 int width = size.x;
 int height = size.y;

Answer 3

 /*
        * A structure describing general information about a display, such as its size, density, and font scaling.
        * */
        DisplayMetrics metrics = getResources().getDisplayMetrics();

       int DeviceTotalWidth = metrics.widthPixels;
       int DeviceTotalHeight = metrics.heightPixels;

How to Get Device Height and Width at Runtime?