面试例题6：两种方法将图像显示在View上

16lz 2022-03-07

题目来自：《android高薪之路—android程序员面试宝典》一书，只是为了个人学习方便

题目：在android工程的res/drawable目录中有一个android.png图像文件，如何将该图像显示在View上

直接代码：

package com.app;
import java.io.InputStream;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.view.View;
public class GetBitmapView extends View{
public GetBitmapView(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint paint = new Paint();
InputStream is = getResources().openRawResource(R.drawable.android);
Options opts = new Options();
opts. inSampleSize=2;
Bitmap bitmap = BitmapFactory. decodeStream(is, null, opts);
canvas.drawBitmap(bitmap, 10, 10, paint);
Drawable drawable = getResources().getDrawable(R.drawable.android);
drawable.setBounds(50, 350, 180, 420);
drawable.setAlpha(100);
drawable.draw(canvas);
}
}

转载于:https://blog.51cto.com/3599672/941098

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