Android图标错误

Question

我从教程网站复制了这段代码,因为我正在努力学习它.但是我收到了错误

package com.android.test;
import android.R;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.Spinner;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;
import android.widget.ImageView.ScaleType;
public class Rotate extends Activity {
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         LinearLayout linearLayout = new LinearLayout(this);

   Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon);

在最后一行,我得到一个错误,其中写有".icon".它说,"图标无法解析或不是一个领域."

int width = bitmap.getWidth(); int height = bitmap.getHeight();

   Matrix matrix = new Matrix();
   matrix.postRotate(90);

   Bitmap rotatedBitmap = Bitmap.createBitmap(bitmap, 0, 0,

width,height,matrix,true); BitmapDrawable bmd = new BitmapDrawable(rotatingBitmap);

   ImageView imageView = new ImageView(this);
   imageView.setImageDrawable(bmd);
   imageView.setScaleType(ScaleType.CENTER);

   linearLayout.addView(imageView, new LinearLayout.LayoutParams(
     LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
   setContentView(linearLayout);
     }
 }

Answer 1

在你的import陈述中,你有

import android.R;

这意味着它会寻找android.R.drawable.icon,而不是R.drawable.icon.android.R包含SDK中所有资产的ID.要访问您自己的资产,您需要删除using语句,或手动编写com.your.package.name.R.drawable.icon

Answer 2

图标有时会起作用,有时却不起作用.将其更改为"ic_launcher".这一直都有效.这是在'res/drawable-？dpi'下找到的文件名.它是Android设备上显示的图标.

像这样:.setIcon(R.drawable.ic_launcher)