我正在eclipse IDE中编写一个图形程序，用23 api版本编译，minSdkVersion =＆＃34; 11＆＃34;保持targetSdkVersion =＆＃34; 16＆＃34;对我来说很重要。 我必须在我的一项活动中使用设备相机（DarjActivity）。一切正常，但由于我试图改进我的代码以支持android marshmallow（api 23）的权限，所以添加了导致一些错误的Check_Permission类。请指导我这个令人困惑的问题！ 谢谢你。
DarjActivity类：
private void selectImage() {
final CharSequence[] items = { "camera", "gallery",
"cancel" };
AlertDialog.Builder builder = new AlertDialog.Builder(DarjActivity.this);
builder.setTitle("capture photo");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
boolean result=Check_Permission.checkPermission(DarjActivity.this);
if (items[item].equals("camera")) {
// userChoosenTask="Take Photo";
if(result);
Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, 1);
} else if (items[item].equals("gallery")) {
// userChoosenTask="Choose from Library";
if(result);
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);//
startActivityForResult(Intent.createChooser(intent, "select"),2);
} else if (items[item].equals("cancel")) {
dialog.dismiss();
}
}
});
builder.show();
}
Check_Permission类：
package com.codegostarNiloo.negar;
import android.Manifest;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.os.Build;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
public class Check_Permission {
public static final int MY_PERMISSIONS_REQUEST_CAMERA = 123;
public static boolean checkPermission(final Context context)
{
int currentAPIVersion = Build.VERSION.SDK_INT;
if(Build.VERSION.SDK_INT >= 23)
// if(currentAPIVersion>=Build.VERSION_CODES.M)
{
if (ContextCompat.checkSelfPermission((Activity) context, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale((Activity) context, Manifest.permission.CAMERA)) {
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(context);
alertBuilder.setCancelable(true);
alertBuilder.setTitle("Check Permission");
alertBuilder.setMessage("pleas let this applicathion to use your device camera");
alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public void onClick(DialogInterface dialog, int which) {
ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_CAMERA);
}
});
AlertDialog alert = alertBuilder.create();
alert.show();
} else {
ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUEST_CAMERA);
}
return false;
} else {
return true;
}
} else {
return true;
}
}
}
这里在Check_Permission类中，（checkSelfPermission），（shouldShowRequestPermissionRationale）和（requestPermissions）方法发生错误。 对于它们的第一个参数，我放置了（Activity）上下文，Context上下文，context，this.Activity，Activity.this，DarjActivity和ext。我更新并替换了bin文件夹中的一些android-support-v4.jar文件。
AndroidManifest权限：
<uses-feature android:name="android.hardware.camera"></uses-feature>
<uses-feature android:name="android.hardware.camera" android:required="false"></uses-feature>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="ANDROID.PERMISSION.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="16" />
答案 0 :(得分：0)
第1步。
首先在您的活动中实施ActivityCompat.OnRequestPermissionsResultCallback
private static final int REQUEST_CAMERA_PERMISSION = 1;
private static final String FRAGMENT_DIALOG = "dialog";
第2步覆盖方法
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults)
{
switch (requestCode)
{
case REQUEST_CAMERA_PERMISSION:
if (permissions.length != 1 || grantResults.length != 1) {
throw new RuntimeException("Error on requesting camera permission.");
}
if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {
Toast.makeText(this, R.string.camera_permission_not_granted,
Toast.LENGTH_SHORT).show();
}
// No need to start camera here; it is handled by onResume
break;
}
}
@Override
protected void onResume()
{
super.onResume();
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
== PackageManager.PERMISSION_GRANTED) {
// Do whatever you want to do after the permission granted.
} else if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.CAMERA)) {
ConfirmationDialogFragment
.newInstance(R.string.camera_permission_confirmation,
new String[]{Manifest.permission.CAMERA},
REQUEST_CAMERA_PERMISSION,
R.string.camera_permission_not_granted)
.show(getSupportFragmentManager(), FRAGMENT_DIALOG);
} else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA},
REQUEST_CAMERA_PERMISSION);
}
}
步骤3编写一个对话框片段以询问权限 - public static class ConfirmationDialogFragment扩展了DialogFragment {
private static final String ARG_MESSAGE = "message";
private static final String ARG_PERMISSIONS = "permissions";
private static final String ARG_REQUEST_CODE = "request_code";
private static final String ARG_NOT_GRANTED_MESSAGE = "not_granted_message";
public static ConfirmationDialogFragment newInstance(@StringRes int message,
String[] permissions, int requestCode, @StringRes int notGrantedMessage) {
ConfirmationDialogFragment fragment = new ConfirmationDialogFragment();
Bundle args = new Bundle();
args.putInt(ARG_MESSAGE, message);
args.putStringArray(ARG_PERMISSIONS, permissions);
args.putInt(ARG_REQUEST_CODE, requestCode);
args.putInt(ARG_NOT_GRANTED_MESSAGE, notGrantedMessage);
fragment.setArguments(args);
return fragment;
}
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Bundle args = getArguments();
return new AlertDialog.Builder(getActivity())
.setMessage(args.getInt(ARG_MESSAGE))
.setPositiveButton(android.R.string.ok,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
String[] permissions = args.getStringArray(ARG_PERMISSIONS);
if (permissions == null)
{
throw new IllegalArgumentException();
}
ActivityCompat.requestPermissions(getActivity(),
permissions, args.getInt(ARG_REQUEST_CODE));
}
})
.setNegativeButton(android.R.string.cancel,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getActivity(),
args.getInt(ARG_NOT_GRANTED_MESSAGE),
Toast.LENGTH_SHORT).show();
}
})
.create();
}
}
步骤4始终检查onResume（）以获取相机权限
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
== PackageManager.PERMISSION_GRANTED)
{
// Do whatever you want to do if permission granted
}
else if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.CAMERA)) {
ConfirmationDialogFragment
.newInstance(R.string.camera_permission_confirmation,
new String[]{Manifest.permission.CAMERA},
REQUEST_CAMERA_PERMISSION,
R.string.camera_permission_not_granted)
.show(getSupportFragmentManager(), FRAGMENT_DIALOG);
} else {
ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.CAMERA},
REQUEST_CAMERA_PERMISSION);
}
希望它有所帮助!!
答案 1 :(得分：0)
或者只使用简单的库，例如PermissionsDispatcher或Dexter或EasyPermissions或许多others。为什么需要通过权限处理来污染代码？