Android-获取view的宽高

最新推荐文章于 2024-08-12 11:42:49 发布

Mars-xq

最新推荐文章于 2024-08-12 11:42:49 发布

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分类专栏：自定义view之路自定义view

本文链接：https://blog.youkuaiyun.com/sinat_31057219/article/details/78394056

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本文介绍了在Android开发中获取View宽高的五种方法：通过监听点击事件、使用addOnGlobalLayoutListener、利用view.post或view.postDelayed、监听窗口焦点变化以及在Activity的生命周期方法中获取。通过示例代码详细展示了各种方法的应用场景及效果。

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方式：

方式1：监听，如setOnClickListener

方式2：监听，如addOnGlobalLayoutListener

方式3：view.post 或 view.postdelay

方式4：onWindowFocusChanged

方式5：

示例：

布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="获取view的宽高" />
</LinearLayout>

代码：

public class MyActivity extends FragmentActivity {

    private Button btn;
    private int mHeight;
    private int mMeasuredHeight;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test3);

        btn = ((Button) this.findViewById(R.id.btn));

        mHeight = btn.getHeight();
        mMeasuredHeight = btn.getMeasuredHeight();
        Log.e("111", "onCreate==" + mHeight + " | " + mMeasuredHeight);//onCreate==0 | 0

        //方式1：监听，如setOnClickListener
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mHeight = btn.getHeight();
                mMeasuredHeight = btn.getMeasuredHeight();
                Log.e("111", "onClick==" + mHeight + " | " + mMeasuredHeight);//onClick==144 | 144
            }
        });

        //方式2：监听，如addOnGlobalLayoutListener
        btn.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

            @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
            @Override
            public void onGlobalLayout() {
                btn.getViewTreeObserver().removeOnGlobalLayoutListener(this);

                mHeight = btn.getHeight();
                mMeasuredHeight = btn.getMeasuredHeight();
                Log.e("111", "onGlobalLayout==" + mHeight + " | " + mMeasuredHeight);//onGlobalLayout==144 | 144
            }
        });

        //方式3：view.post
        btn.post(new Runnable() {
            @Override
            public void run() {
                mHeight = btn.getHeight();
                mMeasuredHeight = btn.getMeasuredHeight();
                Log.e("111", "post==" + mHeight + " | " + mMeasuredHeight);//post==144 | 144
            }
        });

    }

    @Override
    protected void onResume() {
        super.onResume();

        mHeight = btn.getHeight();
        mMeasuredHeight = btn.getMeasuredHeight();
        Log.e("111", "onResume==" + mHeight + " | " + mMeasuredHeight);//onResume==0 | 0
    }

    @Override
    protected void onStart() {
        super.onStart();
        mHeight = btn.getHeight();
        mMeasuredHeight = btn.getMeasuredHeight();
        Log.e("111", "onStart==" + mHeight + " | " + mMeasuredHeight);//onStart==0 | 0
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);

        mHeight = btn.getHeight();
        mMeasuredHeight = btn.getMeasuredHeight();
        Log.e("111", "onWindowFocusChanged==" + mHeight + " | " + mMeasuredHeight);//onWindowFocusChanged==144 | 144
    }
}

打印log顺序：

onCreate==0 | 0
onStart==0 | 0
onResume==0 | 0
onGlobalLayout==144 | 144
post==144 | 144
onWindowFocusChanged==144 | 144