Android 兼容7.0打开摄像头拍照

7.0之前

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    public static final int TAKE_PHOTO = 1;
    public static final int CROP_PHOTO = 2;
    private Button takePhoto;
    private ImageView picture;
    private Uri imageUri;

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

        takePhoto = (Button) findViewById(R.id.take_photo);
        picture = (ImageView) findViewById(R.id.picture);

        takePhoto.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.take_photo:
                File outputImage = new File(Environment.getExternalStorageDirectory(),
                        "tempImage" + ".jpg");
                try {
                    if (outputImage.exists()) {
                        outputImage.delete();
                    }
                    outputImage.createNewFile();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                imageUri = Uri.fromFile(outputImage);
                Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                startActivityForResult(intent, TAKE_PHOTO);
                break;
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case TAKE_PHOTO:
                if (resultCode == RESULT_OK) {
                    Intent intent = new Intent("com.android.camera.action.CROP");
                    intent.setDataAndType(imageUri, "image/*");
                    intent.putExtra("scale", true);
                    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                    startActivityForResult(intent, CROP_PHOTO); // 启动裁剪程序
                }
                break;
            case CROP_PHOTO:
                if (resultCode == RESULT_OK) {
                    try {
                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver()
                                .openInputStream(imageUri));
                        picture.setImageBitmap(bitmap);
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }
                }
                break;
        }
    }
}

7.0之后进行部分代码调整

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    public static final int PHOTO_REQUEST_CAREMA = 1;// 拍照
    public static final int CROP_PHOTO = 2;
    private Button takePhoto;
    private ImageView picture;
    private Uri imageUri;

    public static File tempFile;


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

        takePhoto = (Button) findViewById(R.id.take_photo);
        picture = (ImageView) findViewById(R.id.picture);

        takePhoto.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.take_photo:
                openCamera(this);
                break;
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case PHOTO_REQUEST_CAREMA:
                if (resultCode == RESULT_OK) {
                    Intent intent = new Intent("com.android.camera.action.CROP");
                    intent.setDataAndType(imageUri, "image/*");
                    intent.putExtra("scale", true);
                    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                    startActivityForResult(intent, CROP_PHOTO); // 启动裁剪程序
                }
                break;
            case CROP_PHOTO:
                if (resultCode == RESULT_OK) {
                    try {
                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver()
                                .openInputStream(imageUri));
                        picture.setImageBitmap(bitmap);
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }
                }
                break;
        }
    }

    public void openCamera(Activity activity) {
        //獲取系統版本
        int currentapiVersion = android.os.Build.VERSION.SDK_INT;
        // 激活相机
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        // 判断存储卡是否可以用，可用进行存储
        if (hasSdcard()) {
            SimpleDateFormat timeStampFormat = new SimpleDateFormat(
                    "yyyy_MM_dd_HH_mm_ss");
            String filename = timeStampFormat.format(new Date());
            tempFile = new File(Environment.getExternalStorageDirectory(),
                    filename + ".jpg");
            if (currentapiVersion < 24) {
                // 从文件中创建uri
                imageUri = Uri.fromFile(tempFile);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
            } else {
                //兼容android7.0 使用共享文件的形式
                ContentValues contentValues = new ContentValues(1);
                contentValues.put(MediaStore.Images.Media.DATA, tempFile.getAbsolutePath());
                //检查是否有存储权限，以免崩溃
                if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                        != PackageManager.PERMISSION_GRANTED) {
                    //申请WRITE_EXTERNAL_STORAGE权限
                    Toast.makeText(this,"请开启存储权限",Toast.LENGTH_SHORT).show();
                    return;
                }
                imageUri = activity.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
            }
        }
        // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CAREMA
        activity.startActivityForResult(intent, PHOTO_REQUEST_CAREMA);
    }

    /*
* 判断sdcard是否被挂载
*/
    public static boolean hasSdcard() {
        return Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED);
    }
}

调取系统相册

Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(intent, CROP_PHOTO);

这里请求码为CROP_PHOTO，因此对上边的CROP_PHOTO做些改造

 @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case TAKE_PHOTO:
                ...
                break;
            case CROP_PHOTO:
                if (resultCode == RESULT_OK) {
                    try {
                        if(data != null) {
                            Uri uri = data.getData();
                            imageUri = uri;
                        }
                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver()
                                .openInputStream(imageUri));
                        picture.setImageBitmap(bitmap);
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }
                }
                break;
            default:
                super.onActivityResult(requestCode, resultCode, data);
                break;
        }
    }