我是Android新手。我在我的Android应用程序中创建了ImageUpload Activity，但它在Apk（23）下工作正常。但每当我在Android Marshmallow上尝试它时，它会在点击图片后崩溃。
这是我的最终文件
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />
<application
android:name=".ParseApplication"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Image"></activity>
<activity android:name=".Main"></activity>
<activity android:name=".SingleItemView"></activity>
</application>
这是主要活动
ImageView viewImage;
Button b;
Button bt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.upload);
b=(Button)findViewById(R.id.btnSelectPhoto);
bt=(Button)findViewById(R.id.uploadbtn);
viewImage=(ImageView)findViewById(R.id.viewImage);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
selectImage();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds options to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
private void selectImage() {
final CharSequence[] options = { "Take Photo", "Choose from Gallery","Cancel" };
AlertDialog.Builder builder = new AlertDialog.Builder(Image.this);
builder.setTitle("Add Photo!");
builder.setItems(options, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (options[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, 1);
}
else if (options[item].equals("Choose from Gallery"))
{
Intent intent = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 2);
}
else if (options[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 == 1) {
File f = new File(Environment.getExternalStorageDirectory().toString());
for (File temp : f.listFiles()) {
if (temp.getName().equals("temp.jpg")) {
f = temp;
break;
}
}
try {
Bitmap bitmap;
BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
bitmap = BitmapFactory.decodeFile(f.getAbsolutePath(),
bitmapOptions);
viewImage.setImageBitmap(bitmap);
String path = android.os.Environment
.getExternalStorageDirectory()
+ File.separator
+ "Phoenix" + File.separator + "default";
f.delete();
OutputStream outFile = null;
File file = new File(path, String.valueOf(System.currentTimeMillis()) + ".jpg");
try {
outFile = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 85, outFile);
outFile.flush();
outFile.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
} else if (requestCode == 2) {
Uri selectedImage = data.getData();
String[] filePath = {MediaStore.Images.Media.DATA};
Cursor c = getContentResolver().query(selectedImage, filePath, null, null, null);
c.moveToFirst();
int columnIndex = c.getColumnIndex(filePath[0]);
String picturePath = c.getString(columnIndex);
c.close();
Bitmap thumbnail = (BitmapFactory.decodeFile(picturePath));
Log.w("path of image ", picturePath + "");
viewImage.setImageBitmap(thumbnail);
}
}
bt.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
bt.setOnClickListener(this);
// Locate the image in res > drawable-hdpi
//Bitmap bitmap = BitmapFactory.decodeResource(getResources(),
// R.id.viewImage);
Bitmap bitmap = ((BitmapDrawable)viewImage.getDrawable()).getBitmap();
// Convert it to byte
ByteArrayOutputStream stream = new ByteArrayOutputStream();
// Compress image to lower quality scale 1 - 100
bitmap.compress(Bitmap.CompressFormat.JPEG, 50, stream);
byte[] image = stream.toByteArray();
// Create the ParseFile
ParseFile file = new ParseFile("temp.jpg", image);
// Upload the image into Parse Cloud
file.saveInBackground();
// Create a New Class called "ImageUpload" in Parse
ParseObject imgupload = new ParseObject("ImageUpload");
// Create a column named "ImageName" and set the string
imgupload.put("ImageName", "Android");
// Create a column named "ImageFile" and insert the image
imgupload.put("ImageFile", file);
// Create the class and the columns
imgupload.saveInBackground();
// Show a simple toast message
Toast.makeText(Image.this, "Image Uploaded",
Toast.LENGTH_SHORT).show();
Intent i = new Intent(getApplicationContext(), Main.class);
startActivity(i);
}
});
}}
HERE IS LOG
java.lang.RuntimeException：将结果ResultInfo {who = null，request = 1，result = -1，data = Intent {}}传递给activity {com.example.user.mnc / com.example.user。 mnc.Image}：java.lang.NullPointerException：尝试获取null数组的长度 在android.app.ActivityThread.deliverResults（ActivityThread.java:3699） 在android.app.ActivityThread.handleSendResult（ActivityThread.java:3742） 在android.app.ActivityThread.-wrap16（ActivityThread.java） 在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1393） 在android.os.Handler.dispatchMessage（Handler.java:102） 在android.os.Looper.loop（Looper.java:148） 在android.app.ActivityThread.main（ActivityThread.java:5417） at java.lang.reflect.Method.invoke（Native Method） 在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:726） 在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:616） 引起：java.lang.NullPointerException：尝试获取null数组的长度 在com.example.user.mnc.Image.onActivityResult（Image.java:99）
答案 0 :(得分：0)
您必须在Android M上询问运行时权限。
http://developer.android.com/intl/es/training/permissions/requesting.html
的更多信息答案 1 :(得分：0)
您的活动文件
private Button takePictureButton;
private ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
takePictureButton = (Button) findViewById(R.id.button_image);
imageView = (ImageView) findViewById(R.id.imageview);
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
takePictureButton.setEnabled(false);
ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE }, 0);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if (requestCode == 0) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED
&& grantResults[1] == PackageManager.PERMISSION_GRANTED) {
takePictureButton.setEnabled(true);
}
}
}
public void takePicture(View view) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
file = Uri.fromFile(getOutputMediaFile());
intent.putExtra(MediaStore.EXTRA_OUTPUT, file);
startActivityForResult(intent, 100);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 100) {
if (resultCode == RESULT_OK) {
imageView.setImageURI(file);
}
}
}
private static File getOutputMediaFile(){
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "CameraDemo");
if (!mediaStorageDir.exists()){
if (!mediaStorageDir.mkdirs()){
return null;
}
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
return new File(mediaStorageDir.getPath() + File.separator +
"IMG_"+ timeStamp + ".jpg");
}
如果您想使用非常通用的布局文件进行测试，可以使用：
<ImageView
android:id="@+id/imageview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_above="@+id/button_image"/>
<Button
android:id="@+id/button_image"
android:layout_width="wrap_content"
android:layout_height="48dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:onClick="takePicture"
android:text="Take a picture!"/>
预设文件 另外，请记住更新权限：
<uses-permission-sdk-23 android:name="android.permission.CAMERA" />
<uses-permission-sdk-23 android:name="android.permission.WRITE_EXTERNAL_STORAGE" />