Question

运行的Android程序结果为何不显示图片

package com.example.sa;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.view.Menu;
import android.widget.ImageView;

public class MainActivity extends Activity {
ImageView imageView;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Bitmap rawBitmap=BitmapFactory.decodeResource(getResources(), R.drawable.z);
int rawHeight=rawBitmap.getHeight();
int rawWidth=rawBitmap.getWidth();
int newHeight=500;
int newWidth=500;
float heightScale=((float)newHeight)/rawHeight;
float widthScale=((float)newWidth)/rawWidth;
Matrix matrix=new Matrix();
matrix.postScale(heightScale, widthScale);
matrix.postRotate(40);
imageView.setImageBitmap(rawBitmap);
}

}

Answer 1

你的imageView这个变量都没有进行初始化，运行程序肯定会崩溃的。

Answer 2

我不是技术出身，是不是网速的问题呢？地址的问题？