Android:显示SD卡图像
Android:显示SD卡图像
提问于 2011-07-18 02:04:49
这快把我逼疯了！下面是我的代码(我知道这个文件是存在的)：
File imageFile = new File("/sdcard/gallery_photo_4.jpg");
ImageView jpgView = (ImageView)findViewById(R.id.imageView);
BitmapDrawable d = new BitmapDrawable(getResources(), imageFile.getAbsolutePath());
jpgView.setImageDrawable(d);错误发生在最后一行(第28行，如下所示)。
错误输出：
W/dalvikvm( 865): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
E/AndroidRuntime( 865): FATAL EXCEPTION: main
E/AndroidRuntime( 865): java.lang.RuntimeException: Unable to start activity ComponentInfo{org.example.camera/org.example.camera.Imgview}: java.lang.NullPointerException
E/AndroidRuntime( 865): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
E/AndroidRuntime( 865): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
E/AndroidRuntime( 865): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
E/AndroidRuntime( 865): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
E/AndroidRuntime( 865): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 865): at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 865): at android.app.ActivityThread.main(ActivityThread.java:4627)
E/AndroidRuntime( 865): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 865): at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 865): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime( 865): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
E/AndroidRuntime( 865): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 865): Caused by: java.lang.NullPointerException
E/AndroidRuntime( 865): at org.example.camera.Imgview.onCreate(Imgview.java:28)
E/AndroidRuntime( 865): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
E/AndroidRuntime( 865): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
E/AndroidRuntime( 865): ... 11 more
W/ActivityManager( 59): Force finishing activity org.example.camera/.Imgview我的布局看起来像(可能不是必需的)：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView android:id="@+id/imageView" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:scaleType="center">
</ImageView>
</LinearLayout>非常感谢你的帮助。
回答 3
Stack Overflow用户
发布于 2012-03-01 10:50:15
这段代码终于对我起作用了：
setContentView(R.layout.main);
ImageView jpgView = (ImageView)findViewById(R.id.imageView);
Bitmap bitmap = BitmapFactory.decodeFile("/sdcard/sample-1.jpg");
jpgView.setImageBitmap(bitmap);发生崩溃是因为在附加jpgview之前没有执行setContentView()：
崩溃的代码：
ImageView jpgView = (ImageView)findViewById(R.id.imageView);
Bitmap bitmap = BitmapFactory.decodeFile("/sdcard/sample-1.jpg");
jpgView.setImageBitmap(bitmap);
setContentView(R.layout.main);Stack Overflow用户
发布于 2011-07-18 02:15:27
String imagePath = Environment.getExternalStorageDirectory().toString() + PATH_TO_IMAGE;
return Drawable.createFromPath(imagePath)Stack Overflow用户
发布于 2012-10-08 22:06:54
使用这行代码从SDCARD获取图像。然后在你的IMAGEVIEW中显示出来
其中"FileInputOutput“是SD卡中的一个文件夹
String path = Environment.getExternalStorageDirectory()+ "/FileInputOutput/img1.jpg";
File imgFile = new File(path);
if(imgFile.exists())
{
Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
ImageView myImage = (ImageView) findViewById(R.id.imageView1);
myImage.setImageBitmap(myBitmap);
}
else
Toast.makeText(v.getContext(),"no IMAGE IS PRESENT'",Toast.LENGTH_SHORT).show();
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/6725718
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