我有一个ImageButton,当我点击它时它会给我一个AlertDialog来将图像添加到我的Imagebutton。当我添加图像时,应用程序变得非常缓慢且滞后。如果我想重新选择图像,则应用程序崩溃。有人可以帮我解决这个问题吗?
代码:
public class MainActivity extends Activity {
private final int SELECT_FILE = 1;
private final int REQUEST_CAMERA = 0;
private ImageButton btnImg;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnImg = (ImageButton) findViewById(R.id.btnAddThumbnail);
btnImg.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
selectImage();
}
});
}
private void selectImage() {
final CharSequence[] items = { "Take Photo", "Choose from gallery",
"Cancel" };
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Add Photo!");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (items[item].equals("Take Photo")) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File f = new File(android.os.Environment.getExternalStorageDirectory(), "temp.jpg");
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
startActivityForResult(intent, REQUEST_CAMERA);
}
else if (items[item].equals("Choose from gallery")) {
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
startActivityForResult(Intent.createChooser(intent, "Select File"), SELECT_FILE);
}
else if (items[item].equals("Cancel")) {
dialog.dismiss();
}
}
});
builder.show();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
if (requestCode == REQUEST_CAMERA) {
File f = new File(Environment.getExternalStorageDirectory().toString());
for (File temp : f.listFiles()) {
if (temp.getName().equals("temp.jpg")) {
f = temp;
break;
}
}
try {
Bitmap bm;
BitmapFactory.Options btmapOptions = new BitmapFactory.Options();
bm = BitmapFactory.decodeFile(f.getAbsolutePath(),btmapOptions);
// bm = Bitmap.createScaledBitmap(bm, 70, 70, true);
btnImg.setImageBitmap(bm);
btnImg.setScaleType(ScaleType.CENTER_INSIDE);
String path = android.os.Environment.getExternalStorageDirectory() + File.separator + "Phoenix" + File.separator + "default";
f.delete();
OutputStream fOut = null;
File file = new File(path, String.valueOf(System.currentTimeMillis()) + ".jpg");
try {
fOut = new FileOutputStream(file);
bm.compress(Bitmap.CompressFormat.JPEG, 85, fOut);
fOut.flush();
fOut.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
} else if (requestCode == SELECT_FILE) {
Uri selectedImageUri = data.getData();
String tempPath = getPath(selectedImageUri, MainActivity.this);
Bitmap bm;
BitmapFactory.Options btmapOptions = new BitmapFactory.Options();
bm = BitmapFactory.decodeFile(tempPath, btmapOptions);
btnImg.setImageBitmap(bm);
btnImg.setScaleType(ScaleType.CENTER_INSIDE);
}
}
}
public String getPath(Uri uri, Activity activity) {
String[] projection = { MediaColumns.DATA };
Cursor cursor = activity.managedQuery(uri, projection, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
}
崩溃后出错:
05-04 20:45:02.890:W / dalvikvm(22576):threadid = 1:线程退出,未捕获异常(group = 0x41d9f2a0) 05-04 20:45:02.895:E / AndroidRuntime(22576):致命异常:主要 05-04 20:45:02.895:E / AndroidRuntime(22576):java.lang.OutOfMemoryError 05-04 20:45:02.895:E / AndroidRuntime(22576):在android.graphics.BitmapFactory.nativeDecodeStream(Native方法) 05-04 20:45:02.895:E / AndroidRuntime(22576):在android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:650) 05-04 20:45:02.895:E / AndroidRuntime(22576):在android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:389) 05-04 20:45:02.895:E / AndroidRuntime(22576):at com.example.spui.MainActivity.onActivityResult(MainActivity.java:95) 05-04 20:45:02.895:E / AndroidRuntime(22576):在android.app.Activity.dispatchActivityResult(Activity.java:5390) 05-04 20:45:02.895:E / AndroidRuntime(22576):在android.app.ActivityThread.deliverResults(ActivityThread.java:3178) 05-04 20:45:02.895:E / AndroidRuntime(22576):在android.app.ActivityThread.handleSendResult(ActivityThread.java:3225) 05-04 20:45:02.895:E / AndroidRuntime(22576):在android.app.ActivityThread.access $ 1100(ActivityThread.java:140) 05-04 20:45:02.895:E / AndroidRuntime(22576):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1275) 05-04 20:45:02.895:E / AndroidRuntime(22576):在android.os.Handler.dispatchMessage(Handler.java:99) 05-04 20:45:02.895:E / AndroidRuntime(22576):在android.os.Looper.loop(Looper.java:137) 05-04 20:45:02.895:E / AndroidRuntime(22576):在android.app.ActivityThread.main(ActivityThread.java:4898) 05-04 20:45:02.895:E / AndroidRuntime(22576):at java.lang.reflect.Method.invokeNative(Native Method) 05-04 20:45:02.895:E / AndroidRuntime(22576):at java.lang.reflect.Method.invoke(Method.java:511) 05-04 20:45:02.895:E / AndroidRuntime(22576):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1006) 05-04 20:45:02.895:E / AndroidRuntime(22576):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) 05-04 20:45:02.895:E / AndroidRuntime(22576):at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分:2)
可能是图像太大而你的内存不足。有些设备会以大尺寸的相当大的图像尺寸记录图像,这反过来会导致您遇到内存问题。处理从网上下载的图像时会发生同样的事情。
我会使用API方法Bitmap.createScaledBitmap
向下缩放位图,以便在设置之前缩小位图。
这里有一篇很好的SO帖子Android: Resize a large bitmap file to scaled output file
我还想补充一点,感谢一个很棒的图书馆AndroidQuery,你可以让你的生活变得更加简单!我在下面添加了一些代码,以展示它如何与您的代码段一起使用。这里有一篇完整的博客文章http://blog.androidquery.com/2011/05/down-sample-images-to-avoid-out-of.html
File file = new File(Environment.getExternalStorageDirectory().toString());
//load image from file, down sample to target width of 300 pixels and set it to the Imageview
aq.id(R.id.avatar).image(file, 300);