通过默认相机活动拍摄高质量图像并将其保存到 SD 卡中

Question

我正在通过默认相机活动（使用intent.put Extras）拍摄一张高分辨率照片，并将其保存到sd卡中，

代码：

public class CameraActivity extends Activity implements OnClickListener {
    /** Called when the activity is first created. */

    Button takepicture ;
    ImageView iv ;
    TextView tv;
    Button show;

    String filepath;
    Intent i;
    Uri mUri;

    final static int cameraData = 0;

    File folder = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        takepicture = (Button) findViewById(R.id.button1);
        iv = (ImageView) findViewById(R.id.imageView1);
        tv = (TextView) findViewById(R.id.textView1);
        show = (Button) findViewById(R.id.button2);
        takepicture.setOnClickListener(this);
        show.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

        switch(v.getId()){

        case R.id.button1:

            String sdcardstate = android.os.Environment.getExternalStorageState();

            if(sdcardstate.contentEquals(android.os.Environment.MEDIA_MOUNTED)){

                 filepath = Environment.getExternalStorageDirectory().getPath();

                 folder = new File(filepath,"wax");

                 if(!folder.exists()){
                     try {
                        folder.createNewFile();
                         Log.d("folder created", "ya");
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                 }

                 mUri = Uri.fromFile(folder);
                 Log.d("bk", mUri.toString());

                 i = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                 i.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mUri);

                 Log.d("extra", "extra");
                 startActivityForResult(i,cameraData);
            }
            break;

        case R.id.button2:

            File f = new File(filepath,"bmp.png");

            Bitmap myBitmap = BitmapFactory.decodeFile(f.getAbsolutePath());              

            iv.setImageBitmap(myBitmap);                
            break;
        }           
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);

        if(resultCode==RESULT_OK){

            tv.setText("Result ok");
            Log.d("ok", "ok");
            Bundle extras = data.getExtras();

            Bitmap bmp = (Bitmap) extras.get("data");
        }
    }
}

相机活动开始，图像被拍摄，但是当我点击保存时，它没有返回并强制关闭。

我已经阅读了很多关于此的主题，了解到必须在相机活动开始之前创建文件，但仍然没有。

请帮忙，我在这个问题上卡了一个星期左右。

Logcat 错误

06-15 16:05:50.205: W/dalvikvm(1780): threadid=10: thread exiting with uncaught exception (group=0x4001d800)
06-15 16:05:50.205: E/AndroidRuntime(1780): FATAL EXCEPTION: GLThread 12
06-15 16:05:50.205: E/AndroidRuntime(1780): java.lang.IllegalArgumentException: No configs match configSpec
06-15 16:05:50.205: E/AndroidRuntime(1780):     at android.opengl.GLSurfaceView$BaseConfigChooser.chooseConfig(GLSurfaceView.java:760)
06-15 16:05:50.205: E/AndroidRuntime(1780):     at android.opengl.GLSurfaceView$EglHelper.start(GLSurfaceView.java:916)
06-15 16:05:50.205: E/AndroidRuntime(1780):     at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1246)
06-15 16:05:50.205: E/AndroidRuntime(1780):     at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1116)
06-15 16:05:50.294: W/ActivityManager(59):   Force finishing activity com.android.camera/.Camera
06-15 16:05:50.444: V/camera(1780): stopPreview

Answer 1

使用以下方法来实现。

在调用 CameraIntent 之前，根据该文件路径创建一个文件和 uri，如下所示。

filename = Environment.getExternalStorageDirectory().getPath() + "/test/testfile.jpg";
imageUri = Uri.fromFile(new File(filename));

// start default camera
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT,
                imageUri);
startActivityForResult (cameraIntent, CAMERA_PIC_REQUEST);

现在，您有了可以在 onAcityvityResult 方法中使用的文件路径，如下所示，

 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(requestCode != CAMERA_PIC_REQUEST || filename == null)
        return;
    ImageView img = (ImageView) findViewById(R.id.image);
    img.setImageURI(imageUri);
}

Answer 2

这闻起来像 outOfMemoryException。而不是直接获取巨大的图片文件，您需要做一些代码魔术，这样它就不会占用所有内存。在此处查看一些文档：http://developer.android.com/training/displaying-bitmaps/index.html

还有一些代码 4 u:

public Bitmap decodeFile(File f, int size){
    try {

        //Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(new FileInputStream(f),null,o);

        //Find the correct scale value. It should be the power of 2.
        int width_tmp=o.outWidth, height_tmp=o.outHeight;
        int scale=1;

        while(true){
            if(width_tmp/2<size) // || height 
                break;
            width_tmp/=2;
            height_tmp/=2;
            scale*=2;
        }

        //Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize=scale;
        return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }

    return null;
}

Answer 3

尽量把所有代码都放在各自的Try Catch Exception处理中。然后调试代码并检查抛出异常的位置。您可能是内存不足异常。

按照这个：

http://developer.android.com/training/camera/photobasics.html

Answer 4

public class MainActivity extends AppCompatActivity {

    private static final int CAMERA_REQUEST = 1888;
    private ImageView imageView;
    private LinearLayout view;
    private TextView photoButton, shareButton, saveButton;
    private Bitmap b, photo;
    private static final int MY_CAMERA_PERMISSION_CODE = 100;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        view = findViewById(R.id.view);
        imageView = findViewById(R.id.image);
        photoButton = this.findViewById(R.id.captur);

        photoButton.setOnClickListener(new View.OnClickListener() {

            @RequiresApi(api = Build.VERSION_CODES.M)
            @Override
            public void onClick(View v) {
                if (checkSelfPermission(Manifest.permission.CAMERA)
                        != PackageManager.PERMISSION_GRANTED) {
                    requestPermissions(new String[]{Manifest.permission.CAMERA},
                            MY_CAMERA_PERMISSION_CODE);
                } else {
                    Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                    startActivityForResult(cameraIntent, CAMERA_REQUEST);

                }
            }
        });

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == MY_CAMERA_PERMISSION_CODE) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(this, "camera permission granted", Toast.LENGTH_LONG).show();
                Intent cameraIntent = new
                        Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(cameraIntent, CAMERA_REQUEST);
            } else {
                Toast.makeText(this, "camera permission denied", Toast.LENGTH_LONG).show();
            }

        }
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == CAMERA_REQUEST && resultCode == Activity.RESULT_OK) {
            photo = (Bitmap) data.getExtras().get("data");
            imageView.setImageBitmap(photo);
            //convert bitmap
            view.setDrawingCacheEnabled(true);

            view.buildDrawingCache(true);
            b = Bitmap.createBitmap(view.getDrawingCache());
            view.setDrawingCacheEnabled(false);

        }
    }
}