從 drawable 文件夾中加載位圖

首先把一個位圖檔案儲存於 drawable 文件夾中, Android SDK 會為它分配一個 ID, 可以通過 "R.drawable.xxx" 被存取.

例如:
/res/drawable/androidbiancheng.png 的 ID 是 R.drawable.androidbiancheng



佈局文件, main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   >
<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<ImageView 
   android:id="@+id/myimage"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   />
<TextView 
   android:id="@+id/myimagewidth"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<TextView 
   android:id="@+id/myimageheight"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
</LinearLayout>

package com.AndroidBtmap;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TextView;

public class AndroidBtmap extends Activity {
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
      
       ImageView myImage = (ImageView)findViewById(R.id.myimage);
       TextView myImageWidth = (TextView)findViewById(R.id.myimagewidth);
       TextView myImageHeight = (TextView)findViewById(R.id.myimageheight);

       Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.androidbiancheng);
       int bitmapWidth  = bitmap.getWidth();
       int bitmapHeight = bitmap.getHeight();
      
       myImage.setImageBitmap(bitmap);
       myImageWidth.setText("Width: " + String.valueOf(bitmapWidth));
       myImageHeight.setText("Height: " + String.valueOf(bitmapHeight));
   }
}

下一篇文章:
- 儲存位圖檔案
- 圖像處理