问题...
我尝试在Android Marshmallow中实现运行时权限，同时保持向后兼容性。我之前成功完成了这项工作，我不确定这次有什么不同。我已经在物理Note 5（运行Mallow）上测试了它，并使用在Marshmallow上设置的模拟器，但都不起作用。
我意识到＆＃34;它没有工作＆＃34;不是很有帮助，但我不知道还有什么可说的，没有任何反应。该应用程序不会崩溃，只是在调用requestPermissions(perms, 222)后挂起。
我做错了什么？
详细...
我活动的相关部分：
public class HomeActivity extends Activity implements View.OnClickListener {
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.btn_home_scancertificate:
if (ContextCompat.checkSelfPermission(HomeActivity.this, "android.permission.CAMERA") != PackageManager.PERMISSION_GRANTED){
showNoPermDialog();
}else {
AppData.ActionType = ActionType.SCAN_CERTIFICATE;
intent = new Intent(HomeActivity.this, CaptureActivity.class);
startActivity(intent);
}
break;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
Log.e("HomeActivity", "Permissions results...");
switch (requestCode) {
case 222: {
boolean granted = (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED);
Log.e("HomeActivity", granted?"granted permission":"denied permission");
AppData.ActionType = ActionType.SCAN_POSTCARD;
intent = new Intent(HomeActivity.this, CaptureActivity.class);
startActivity(intent);
}
}
}
public void getCamPerm(){
Log.e("HomeActivity", "Build version: "+Build.VERSION.SDK_INT);
if (Build.VERSION.SDK_INT >= 23) {
Log.e("HomeActivity", "Getting permissions");
String[] perms = new String[]{Manifest.permission.CAMERA};
requestPermissions(perms, 222);
}
}
public void showNoPermDialog(){
if (Build.VERSION.SDK_INT >= 23) {
boolean showRationale = shouldShowRequestPermissionRationale(Manifest.permission.CAMERA);
String status = showRationale ? "showing rationale" : "skipping rationale";
Log.e("HomeActivity", status);
if (showRationale) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setTitle("Need permission");
alertDialogBuilder
.setMessage("App requires camera permission for the use of the scanner.")
.setCancelable(false)
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
getCamPerm();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}else getCamPerm();
}else {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setTitle("Need permission");
alertDialogBuilder
.setMessage("App requires permission to use the camera. You have disabled camera permission. Please re-enable this permission thru Settings -> Apps -> Our Town -> Permissions.")
.setCancelable(false)
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
}
}
运行时，只会记录这些内容（根本不会调用onRequestPermissionsResult()）
E / HomeActivity：跳过理由
E / HomeActivity：构建版本：23
E / HomeActivity：获取权限
清单包括：<uses-permission android:name="android.permission.CAMERA" />
修改
仅在我第一次点击按钮时，它会显示在Logcat中，似乎是通过调用shouldShowRequestPermissionRationale()
08-17 11:26:36.996 20660-20660/com.ourtownamerica.ourtowntrutrak W/ViewRootImpl: Cancelling event due to no window focus: MotionEvent { action=ACTION_CANCEL, actionButton=0, id[0]=0, x[0]=1035.6592, y[0]=770.2344, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=8508970, downTime=8506643, deviceId=0, source=0x1002 }
08-17 11:26:36.996 20660-20660/com.ourtownamerica.ourtowntrutrak W/ViewRootImpl: Cancelling event due to no window focus: MotionEvent { action=ACTION_CANCEL, actionButton=0, id[0]=0, x[0]=1035.6592, y[0]=770.2344, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=8508970, downTime=8506643, deviceId=0, source=0x1002 }
08-17 11:26:36.996 20660-20660/com.ourtownamerica.ourtowntrutrak W/ViewRootImpl: Cancelling event due to no window focus: MotionEvent { action=ACTION_CANCEL, actionButton=0, id[0]=0, x[0]=1035.6592, y[0]=770.2344, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=8508970, downTime=8506643, deviceId=0, source=0x1002 }
08-17 11:26:36.997 20660-20660/com.ourtownamerica.ourtowntrutrak W/ViewRootImpl: Cancelling event due to no window focus: MotionEvent { action=ACTION_CANCEL, actionButton=0, id[0]=0, x[0]=1035.6592, y[0]=770.2344, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=8508970, downTime=8506643, deviceId=0, source=0x1002 }
编辑2
我从它所在的Activity中复制了我原来的相同代码并将其移动到了splash活动中，并且在那里工作正常。它现在可以留在那里，但如果有人知道输入的内容仍然受到赞赏。
答案 0 :(得分：0)
好吧，尝试使用Manifest.permission.CAMERA而不是＆＃34; android.permission.CAMERA＆＃34;
同样用于代码质量检查按钮单击本身是否为23或 R.id.btn_home_scancertificate：
if (Build.VERSION.SDK_INT >= 23 && ContextCompat.checkSelfPermission(activity,
Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
showNoPermDialog();
} else {
AppData.ActionType = ActionType.SCAN_CERTIFICATE;
intent = new Intent(HomeActivity.this, CaptureActivity.class);
startActivity(intent);
}
//in alertdialog button simply place this for requesting permission
ActivityCompat.requestPermissions(activity,
new String[]{Manifest.permission.CAMERA},
222);
答案 1 :(得分：0)
对于M权限，我一直在使用this answer中的以下类：
public class MarshmallowPermission {
public static final int EXTERNAL_STORAGE_PERMISSION_REQUEST_CODE = 2;
public static final int CAMERA_PERMISSION_REQUEST_CODE = 3;
public MarshmallowPermission() {
}
public boolean checkPermissionForExternalStorage(Activity activity) {
if(Build.VERSION.SDK_INT >= 23) {
int result = ContextCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);
if(result == PackageManager.PERMISSION_GRANTED) {
return true;
} else {
return false;
}
} else {
return true;
}
}
public boolean checkPermissionForCamera(Activity activity) {
if(Build.VERSION.SDK_INT >= 23) {
int result = ContextCompat.checkSelfPermission(activity, Manifest.permission.CAMERA);
if(result == PackageManager.PERMISSION_GRANTED) {
return true;
} else {
return false;
}
} else {
return true;
}
}
public void requestPermissionForExternalStorage(Activity activity) {
if(ActivityCompat.shouldShowRequestPermissionRationale(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
Toast.makeText(activity,
"External Storage permission needed. Please allow in App Settings for additional functionality.",
Toast.LENGTH_LONG).show();
} else {
ActivityCompat.requestPermissions(activity,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
EXTERNAL_STORAGE_PERMISSION_REQUEST_CODE);
}
}
public void requestPermissionForCamera(Activity activity) {
if(ActivityCompat.shouldShowRequestPermissionRationale(activity, Manifest.permission.CAMERA)) {
Toast.makeText(activity,
"Camera permission needed. Please allow in App Settings for additional functionality.",
Toast.LENGTH_LONG).show();
} else {
ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.CAMERA}, CAMERA_PERMISSION_REQUEST_CODE);
}
}
}
像这样工作：
if(marshmallowPermission.checkPermissionForCamera(activity)) {
// has camera
} else {
marshmallowPermission.requestPermissionForCamera(activity);
}
并在Activity回调中处理
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
// handle request code
}
答案 2 :(得分：0)