Android中正方形TextView的实现

分类：Android, Java 阅读 (2,109)

8月 012020

转载请注明原文地址：http://bcoder.com/java/implement-custom-square-textview-in-android

　　本自定义组件实现了一个以高度为标准的正方形TextView组件，如果想以其他标准（最大或者最小宽度、高度）需要再进行修改：

　　自定义View的代码如下；

import android.content.Context;
import android.util.AttributeSet;

public class SquareTextView extends android.support.v7.widget.AppCompatTextView {
    private String LOG_TAG = "SquareTextView";

    public SquareTextView(Context context) {
        super(context);

    }

    public SquareTextView(Context context, AttributeSet attrs) {
        super(context, attrs);

    }

    public SquareTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // 先让父类计算宽度和高度
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        // 以父类计算的高度获取我们想要的宽度
        int w = MeasureSpec.makeMeasureSpec(getMeasuredHeight(), MeasureSpec.EXACTLY);
        // 如果只使用setMeasuredDimension会造成对齐效果的失效
        // setMeasuredDimension(getMeasuredHeight(), getMeasuredHeight());
        // 让父类重新计算
        super.onMeasure(w, heightMeasureSpec);
    }

}

import android.content.Context;

import android.util.AttributeSet;

public class SquareTextView extends android.support.v7.widget.AppCompatTextView {

private String LOG_TAG = "SquareTextView";

public SquareTextView(Context context) {

super(context);

}

public SquareTextView(Context context, AttributeSet attrs) {

super(context, attrs);

}

public SquareTextView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

// 先让父类计算宽度和高度

super.onMeasure(widthMeasureSpec, heightMeasureSpec);

// 以父类计算的高度获取我们想要的宽度

int w = MeasureSpec.makeMeasureSpec(getMeasuredHeight(), MeasureSpec.EXACTLY);

// 如果只使用setMeasuredDimension会造成对齐效果的失效

// setMeasuredDimension(getMeasuredHeight(), getMeasuredHeight());

// 让父类重新计算

super.onMeasure(w, heightMeasureSpec);

}

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