Question

我创建了一个按钮，显示从相机拍摄照片或从照片库中选择图像的选项。图像将定向到同一活动中的imageview。当相机用于获取图像时，它按预期工作，而应用程序在从图库中选择图像后停止，而不是在imageview中显示。我无法弄清楚是否由于图像解析缩略图或者代码中缺少某些内容？

This is the error

主要活动：

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class MainActivity extends Activity {
ImageView vitb;
Button btcm;
static final int REQUEST_IMAGE_CAPTURE = 1;
static final int REQUEST_IMAGE_SELECT = 2;
@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);
    vitb = (ImageView) findViewById(R.id.imageView);
    btcm = (Button) findViewById(R.id.btn_cam);

    btcm.setOnClickListener(new View.OnClickListener() {

        @Override

        public void onClick(View v) {

            selectImage();

        }

    });

}

private void selectImage() {



    final CharSequence[] options = { "Take Photo", "Choose from 
Gallery","Cancel" };



    AlertDialog.Builder builder = new 
AlertDialog.Builder(MainActivity.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);
                startActivityForResult(intent,REQUEST_IMAGE_CAPTURE);

            }

            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,REQUEST_IMAGE_SELECT);

            }

            else if (options[item].equals("Cancel")) {

                dialog.dismiss();

            }

        }

    });

    builder.show();

}



@Override

protected void onActivityResult(int requestCode, int resultCode, Intent 
data) {

     if (resultCode == RESULT_OK) {

        if (requestCode == 1) {

            Bundle bundle = data.getExtras();
            Bitmap bmp = (Bitmap)bundle.get("data");
            vitb.setImageBitmap(bmp);
        }
        else if (requestCode == 2) {

            Uri selectedImage = data.getData();
            String[] filePathColumn = { MediaStore.Images.Media.DATA };

            Cursor cursor = getContentResolver().query(selectedImage,
                    filePathColumn, null, null, null);
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();

            ImageView imageView = (ImageView) findViewById(R.id.imageView);
            imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));

        }

    }

}

}

logcat的：

01-21 22:53:56.345 20914-20914/com.dot.hackathon E/AndroidRuntime: FATAL 
EXCEPTION: main
                                                               Process: 
com.dot.hackathon, PID: 20914

java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, 
request=2, result=-1, data=Intent { 
dat=content://media/external/images/media/44167 }} to activity 
{com.dot.hackathon/com.dot.hackathon.MainActivity}: 
java.lang.SecurityException: Permission Denial: reading 
com.android.providers.media.MediaProvider uri 
content://media/external/images/media/44167 from pid=20914, uid=10118 
requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
                                                                   at 
android.app.ActivityThread.deliverResults(ActivityThread.java:3782)
                                                                   at 
android.app.ActivityThread.handleSendResult(ActivityThread.java:3825)
                                                                   at 
android.app.ActivityThread.access$1500(ActivityThread.java:164)
                                                                   at 
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1511)
                                                                   at 
android.os.Handler.dispatchMessage(Handler.java:102)
                                                                   at 
android.os.Looper.loop(Looper.java:159)
                                                                   at 
android.app.ActivityThread.main(ActivityThread.java:5541)
                                                                   at 
java.lang.reflect.Method.invoke(Native Method)
                                                                   at 
java.lang.reflect.Method.invoke(Method.java:372)
                                                                   at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run  
(ZygoteInit.java:964)
                                                                   at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:759)
                                                                Caused by: 
java.lang.SecurityException: Permission Denial: reading 
com.android.providers.media.MediaProvider uri 
content://media/external/images/media/44167 from pid=20914, uid=10118 
requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
                                                                   at 
android.os.Parcel.readException(Parcel.java:1559)
                                                                   at 
android.database.DatabaseUtils.readExceptionFromParcel 
(DatabaseUtils.java:185)
                                                                   at 
android.database.DatabaseUtils.readExceptionFromParcel 
(DatabaseUtils.java:137)
                                                                   at 
android.content.ContentProviderProxy.query(ContentProviderNative.java:421)
                                                                   at 
android.content.ContentResolver.query(ContentResolver.java:527)
                                                                   at 
android.content.ContentResolver.query(ContentResolver.java:471)
                                                                   at 
com.dot.hackathon.MainActivity.onActivityResult(MainActivity.java:125)
                                                                   at 
android.app.Activity.dispatchActivityResult(Activity.java:6309)
                                                                   at 
android.app.ActivityThread.deliverResults(ActivityThread.java:3778)
                                                                   at 
android.app.ActivityThread.handleSendResult(ActivityThread.java:3825) 
                                                                   at 
android.app.ActivityThread.access$1500(ActivityThread.java:164) 
                                                                   at 
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1511) 
                                                                   at 
android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                   at 
android.os.Looper.loop(Looper.java:159) 
                                                                   at 
android.app.ActivityThread.main(ActivityThread.java:5541) 
                                                                   at 
java.lang.reflect.Method.invoke(Native Method) 
                                                                   at 
java.lang.reflect.Method.invoke(Method.java:372) 
                                                                   at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run 
(ZygoteInit.java:964) 
                                                                   at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:759) 
01-21 22:53:56.445 20914-20914/com.dot.hackathon I/Process: Sending signal. 
PID: 20914 SIG: 9
01-21 22:53:56.445 20914-20914/com.dot.hackathon V/Process: killProcess 
[20914] 
Callers=com.android.internal.os.RuntimeInit$UncaughtHandler. 
uncaughtException:99 java.lang.ThreadGroup.uncaughtException:693 
java.lang.ThreadGroup.uncaughtException:690 <bottom of call stack>

Answer 1

试试这个

在清单文件中添加此权限。

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

FYI

Run Time Permissions Requesting

如何查看运行时权限，请查看下面的代码片段

<强>步骤1

 private boolean checkPermission() {
        int result = ContextCompat.checkSelfPermission(Your_Activity.this, android.Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if (result == PackageManager.PERMISSION_GRANTED) {
            return true;
        } else {
            return false;
        }
    }

<强>第二步

 private void requestPermission() {

        if (ActivityCompat.shouldShowRequestPermissionRationale(Your_Activity.this, android.Manifest.permission.WRITE_EXTERNAL_STORAGE)) {

            //Here you can explain why you need this permission
            //Explain here why you need this permission

        } else {
            ActivityCompat.requestPermissions(Your_Activity.this, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE);
        }
    }

<强>步骤3

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
        case PERMISSION_REQUEST_CODE:
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Log.i("TAG", "Permission Granted");
            } else {
                Log.i("TAG", "Permission Denied.");
            }
            break;
    }
}

从图库中选择图像到imageview时，app停止

1 个答案:

FYI