我一直在尝试实现此代码，我从相机捕获图像并将其显示在我的图像查看器中，然后可以将其设置为墙纸。它在我的模拟器中正常工作，但在我的手机上，当我拍摄图像并单击确定时 - 它强制关闭。有什么帮助吗？
ImageButton ib;
Button b;
ImageView iv;
Intent i;
final static int cameraData = 0;
Bitmap bmp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.photo);
initialize();
InputStream is = getResources().openRawResource(R.drawable.icon);
bmp = BitmapFactory.decodeStream(is);
}
private void initialize() {
iv = (ImageView) findViewById(R.id.ivReturnedPic);
ib = (ImageButton) findViewById(R.id.ibTakePic);
b = (Button) findViewById(R.id.bSetWall);
b.setOnClickListener(this);
ib.setOnClickListener(this);
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.bSetWall:
try {
getApplicationContext().setWallpaper(bmp);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case R.id.ibTakePic:
i = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(i, cameraData);
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
bmp = (Bitmap) extras.get("data");
iv.setImageBitmap(bmp);
}
}
这让我发疯了！
这是我认为的logcat中的错误，
09-04 09:07:49.034: VERBOSE/com.miui.camera.CameraHolder(7499): camera released
09-04 09:07:49.064: WARN/System.err(7463): java.lang.NullPointerException
09-04 09:07:49.064: WARN/System.err(7463): at com.aradhya.helloandroid.Camera.onActivityResult(Camera.java:72)
09-04 09:07:49.064: WARN/System.err(7463): at android.app.Activity.dispatchActivityResult(Activity.java:3932)
09-04 09:07:49.064: WARN/System.err(7463): at android.app.ActivityThread.deliverResults(ActivityThread.java:2536)
09-04 09:07:49.064: WARN/System.err(7463): at android.app.ActivityThread.handleSendResult(ActivityThread.java:2582)
09-04 09:07:49.074: WARN/System.err(7463): at android.app.ActivityThread.access$2000(ActivityThread.java:117)
09-04 09:07:49.074: WARN/System.err(7463): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:961)
09-04 09:07:49.074: WARN/System.err(7463): at android.os.Handler.dispatchMessage(Handler.java:99)
09-04 09:07:49.094: WARN/System.err(7463): at android.os.Looper.loop(Looper.java:130)
09-04 09:07:49.094: WARN/System.err(7463): at android.app.ActivityThread.main(ActivityThread.java:3694)
09-04 09:07:49.094: WARN/System.err(7463): at java.lang.reflect.Method.invokeNative(Native Method)
09-04 09:07:49.094: WARN/System.err(7463): at java.lang.reflect.Method.invoke(Method.java:507)
09-04 09:07:49.094: WARN/System.err(7463): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
09-04 09:07:49.104: WARN/System.err(7463): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
09-04 09:07:49.104: WARN/System.err(7463): at dalvik.system.NativeStart.main(Native Method)
09-04 09:07:49.204: VERBOSE/com.miui.camera.Camera(7499): stopPreview
09-04 09:07:49.214: ERROR/com.miui.camera.ui.FocusRectangle(7499): clear
09-04 09:07:49.373: VERBOSE/com.miui.camera.Camera(7499): onStop
09-04 09:07:49.383: VERBOSE/com.miui.camera.Camera(7499): onDestroy
答案 0 :(得分：1)
看起来你的rom是MIUI（或者你正在使用MUI相机）
我在MIUI上使用我的HTC Desire进行一些android开发，看起来来自相机的返回意图数据与从orroids本机相机返回的通常意图数据不同;你需要改变活动结果来接受来自MIUI相机的数据（我现在正在研究这个我会发布我的解决方案，如果我能解决的话）
编辑：好的我在调查了miui相机意图后设法对问题进行了排序：来自MIUI相机的返回数据包含NO EXTRAS，但确实包含了sdcard上图像的路径，所以我编辑了我的onActivityResult相应地根据返回数据中的内容处理意图：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == CAMERA_PIC_REQUEST)
{
if(resultCode == RESULT_OK)
{
if(data.hasExtra("data"))
{
/* if the data has an extra called "data" we assume the returned data
* is from the usual camera app*/
//retrieve the bitmap from the intent
Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
//update the image view with the bitmap
myImageView.setImageBitmap(thumbnail);
}
else if(data.getExtras()==null)
{
/* if there are no extras we assume its the miui camera
* (which returns the path to the image in the returned data)*/
Toast.makeText(getApplicationContext(), "No extras to retrieve!",Toast.LENGTH_SHORT).show();
//retrieve the path from the intent using data.getData().getPath() and create a BitmapDrawable using this path
BitmapDrawable thumbnail = new BitmapDrawable(getResources(), data.getData().getPath());
//update the image view with the newly created drawable
myImageView.setImageDrawable(thumbnail);
}
}
else if (resultCode == RESULT_CANCELED)
{
Toast.makeText(getApplicationContext(), "Cancelled",Toast.LENGTH_SHORT).show();
}
}
}
EDIT2：在我的应用程序中，我还有一个选择器，可以使用图库从SD卡中选择现有图片，并且已经为MIUI图库发现了同样的问题，所以如果您在应用程序中也粘贴图像选择器这个代码对于onActivityResult的工作原理：
else if (requestCode == GALLERY_REQUEST)
{
if(resultCode == RESULT_OK)
{
if (data != null) {
//our BitmapDrawable for the thumbnail
BitmapDrawable bmpDrawable = null;
//try to retrieve the image using the data from the intent
Cursor cursor = getContentResolver().query(data.getData(), null, null, null, null);
if(cursor != null)
{
/*if the query worked the cursor will not be null,
* so we assume the normal gallery was used to choose the picture*/
cursor.moveToFirst(); //if not doing this, 01-22 19:17:04.564: ERROR/AndroidRuntime(26264): Caused by: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 1
int idx = cursor.getColumnIndex(ImageColumns.DATA);
String fileSrc = cursor.getString(idx);
Bitmap bitmapPreview = BitmapFactory.decodeFile(fileSrc); //load preview image
bmpDrawable = new BitmapDrawable(bitmapPreview);//set the BitmapDrawable to the loaded image
}
else
{
/*if the cursor is null after the query the data returned is different so we assume
* the miui gallery was used (so the data contains the path to the image)*/
bmpDrawable = new BitmapDrawable(getResources(), data.getData().getPath());
}
myImageView.setImageDrawable(bmpDrawable);//update our imageview with the BitmapDrawable
}
else {
Toast.makeText(getApplicationContext(), "Cancelled",Toast.LENGTH_SHORT).show();
}
}
else if (resultCode == RESULT_CANCELED)
{
Toast.makeText(getApplicationContext(), "Cancelled",Toast.LENGTH_SHORT).show();
}
}
答案 1 :(得分：0)
我不知道导致问题的是哪一行（哪里是72？）我猜你得到空数据或意图包是空的。
首先，我会检查onActivityResult上的请求代码，它应该与您调用时使用的代码相同：
startActivityForResult(i, cameraData);
我要尝试的第二件事是使用输出文件名调用相机意图，并在onActivityResult上尝试从SD卡加载图像。 看看in this example该怎么做。
祝你好运