在MainActivity中检查View的尺寸

Question

我想获取在activity_main.xml中定义的View的尺寸，以Bitmap基于高度和宽度创建一个。将它们写入show textView0或停止应用。我检查了此视图是否为null，但不是。我可以这样获取视图尺寸吗？这是代码：@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    TextView textView = (TextView) findViewById(R.id.textView);    View view = (View) findViewById(R.id.view);    int x = view.getMeasuredWidth();    int y = view.getHeight();    int radius = 10;    textView.setText(view.getHeight());// if (view == null) textView.setText("View is null");// else textView.setText("View is not null");    Bitmap bitmap = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888);这是actvity_main.xml：<View    android:id="@+id/view"    android:layout_width="400dp"    android:layout_height="400dp"    android:layout_marginLeft="44dp"    android:layout_marginStart="44dp"    android:layout_marginTop="136dp"    android:background="@color/green"    app:layout_constraintStart_toStartOf="parent"    app:layout_constraintTop_toTopOf="parent" /><TextView    android:id="@+id/textView"    android:layout_width="209dp"    android:layout_height="48dp"    android:layout_marginLeft="44dp"    android:layout_marginStart="44dp"    android:layout_marginTop="28dp"    android:text="TextView"    app:layout_constraintStart_toStartOf="parent"    app:layout_constraintTop_toTopOf="parent" />

Answer 1

您可以尝试此解决方案

int height;

int width;

ViewTreeObserver viewTreeObserver = view.getViewTreeObserver(); 

viewTreeObserver .addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

    @Override public void onGlobalLayout () {

        view.getViewTreeObserver().removeGlobalOnLayoutListener(this);

        height = view.getLayoutParams().height;

        width = view.getLayoutParams().width;

    }

});