Question

我需要相对/线性布局的运行时尺寸。

activity_home.xml ：

<RelativeLayout
    android:id="@+id/rlParent"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
</RelativeLayout>

HomeActivity.java：

private int width, height;

RelativeLayout rlParent = (RelativeLayout) findViewById(R.id.rlParent);

w = rlParent.getWidth();
h = rlParent.getHeight();

Log.i("Width-Height", width+"-"+height);

请分享您的想法。

Answer 1

试试这个

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    // TODO Auto-generated method stub
    super.onWindowFocusChanged(hasFocus);
    updateSizeInfo();
}

private void updateSizeInfo() {
    RelativeLayout rlayout = (RelativeLayout) findViewById(R.id.rlayout);
    w = rlayout.getWidth();
    h = rlayout.getHeight();
    Log.v("W-H", w+"-"+h);
}

Answer 2

您可以将OnGlobalLayoutListener附加到相对布局的ViewTreeObserver，当视图附加到窗口并且为其分配实际高度时，将调用它。

final RelativeLayout rl_cards_details_card_area = (RelativeLayout) findViewById(R.id.rl_cards_details_card_area);
        rl_cards_details_card_area.getViewTreeObserver()
                .addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

                    @Override
                    public void onGlobalLayout() {
                        // TODO Auto-generated method stub
                        int w = rl_cards_details_card_area.getWidth();
                        int h = rl_cards_details_card_area.getHeight();
                        Log.v("W-H", w + "-" + h);
                        rl_cards_details_card_area.getViewTreeObserver()
                                .removeOnGlobalLayoutListener(this);
                    }
                });

Answer 3

我已经通过这种方式实施了：

LinearLayout linearLayout = (LinearLayout)findViewById(R.id.layout);
ViewTreeObserver viewTreeObserver = linearLayout.getViewTreeObserver(); 
viewTreeObserver.addOnGlobalLayoutListener(new OnGlobalLayoutListener() { 
    @Override 
    public void onGlobalLayout() { 
        linearLayout.getViewTreeObserver().removeGlobalOnLayoutListener(this); 
        int width  = linearLayout.getMeasuredWidth();
        int height = linearLayout.getMeasuredHeight(); 

    } 
});

此示例适用于线性布局，相对布局遵循相同的流程。

希望这会对你有所帮助。

Answer 4

尝试这样：

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class AndroidResizeView extends Activity {

    TextView textMyTextView;
    Button myButton;

    RelativeLayout rlayout;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.hightk);

        rlayout = (RelativeLayout) findViewById(R.id.rlayout);

        textMyTextView = (TextView) findViewById(R.id.textView1);

        myButton = (Button) findViewById(R.id.button1);

        myButton.setOnClickListener(new Button.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                updateSizeInfo();
            }
        });
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        // TODO Auto-generated method stub
        super.onWindowFocusChanged(hasFocus);
        updateSizeInfo();
    }

    private void updateSizeInfo() {

        textMyTextView.setText(String.valueOf("Width: "
                + rlayout.getWidth() + "height ::" + rlayout.getHeight()));

    }

}

Answer 5

我们可能无法在创建活动后立即获得正确的高度和视图或布局，因为布局没有完全膨胀

所以

1.你可以在几秒之后触发一个runnable方法，然后调用一个获取width和height属性的函数。

2.我们可以使用视图树观察器

 l = (RelativeLayout)findviewbyid(R.id.rl_cards_details_card_area);
ViewTreeObserver observer = l.getViewTreeObserver();
    observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

        @Override
        public void onGlobalLayout() {
            // TODO Auto-generated method stub
            ActivityClassName.this.getProperties();
        l.getViewTreeObserver().removeGlobalOnLayoutListener(
                this);
    }
});
void getProperties() {
    int a= l.getHeight();
        int b = l.getWidth();
    Toast.makeText(getActivity,""+a+" "+b,1000).show();
    }

Answer 6

对于Kotlin ：您可以使用AndroidX的doOnLayout扩展功能来获取布局的高度或宽度

view.doOnLayout {
  Timber.d("View's Height: ${view.height}")
}

布局此视图时，执行给定的操作。如果视图有   布局，并且尚未请求布局，则操作将为   立即执行，否则操作将在之后执行   接下来是视图。

该动作仅在下一个布局上被调用一次，然后   删除。 For more info

如何在android中以编程方式获取相对 - 线性布局的宽度和高度？

6 个答案: