Android自4.4(Api 19)开始,读写应用自身的文件已经不需要读写SD卡权限了
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
我在测试调用摄像头拍照截图返回功能时,发现一些问题(自己暂时还不能理解),在此记录一下,如果有人知道原因,请留言告诉我一下
1、android.permission.WRITE_EXTERNAL_STORAGE权限问题
如果我不在应用里面配置android.permission.WRITE_EXTERNAL_STORAGE权限,发现应用不仅无法启动拍照界面,而且会crash掉(log里面还没有一点信息)。
如果配置了android.permission.WRITE_EXTERNAL_STORAGE权限(无论在设置里面是否允许应用获取该权限),都可以成功启动拍照界面,然后返回照片的uri。
private void method1() {
File image = new File(getExternalCacheDir(), "outImage,jpg");
if (!image.exists()) {
try {
image.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
mImageUri = FileProvider.getUriForFile(this, AUTHORITY, image);
} else {
mImageUri = Uri.fromFile(image);
}
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, mImageUri);
startActivityForResult(intent, 1);
}
onActivityResult的log并没有打出来,该Activity就被关闭了
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
log("on activity result");
switch (requestCode) {
case 1:
if(resultCode == RESULT_OK) {
try {
log("ready decode bitmap");
Bitmap bmp = BitmapFactory.decodeStream(getContentResolver().openInputStream(mImageUri));
log("after decode bitmap");
mLinearLayout.setBackground(new BitmapDrawable(getResources(),bmp));
} catch (Exception e) {
e.printStackTrace();
}
}
break;
default:
break;
}
}
2、android.permission.CAMERA问题
如果你的应用没有配置android.permission.CAMERA权限,则不会出现下面的问题。如果你的应用配置了android.permission.CAMERA权限,那么你的应用必须获得该权限的授权,否则会出错
java.lang.SecurityException: Permission Denial: starting Intent { act=android.media.action.IMAGE_CAPTURE flg=0x3 cmp=com.android.camera2/com.android.camera.CaptureActivity clip={text/uri-list U:content://com.gui.test1.file.provider/my_images/Android/data/com.gui.test1/cache/outImage%2Cjpg} (has extras) } from ProcessRecord{3cda00d 15266:com.gui.test1/u0a133} (pid=15266, uid=10133) with revoked permission android.permission.CAMERA
3、获取拍照缩略图
如果只需要获取拍照的缩略图(比如头像),可以不传uri
private void method3() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, 2);
}
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
log("on activity result");
switch (requestCode) {
case 2:
if(resultCode == RESULT_OK) {
Bitmap bmp = data.getParcelableExtra("data");
mLinearLayout.setBackground(new BitmapDrawable(getResources(),bmp));
}
break;
default:
break;
}
}