因为项目要用到推送功能，所以需要知道用户是否开启了通知栏的权限，并且可以方便直接跳转到权限设置以便用户进行开启。
- 获取权限工具类
public class NotificationsUtils {
private static final String CHECK_OP_NO_THROW = "checkOpNoThrow";
private static final String OP_POST_NOTIFICATION = "OP_POST_NOTIFICATION";
@SuppressLint("NewApi")
public static boolean isNotificationEnabled(Context context) {
AppOpsManager mAppOps =
(AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
ApplicationInfo appInfo = context.getApplicationInfo();
String pkg = context.getApplicationContext().getPackageName();
int uid = appInfo.uid;
Class appOpsClass = null;
/* Context.APP_OPS_MANAGER */
try {
appOpsClass = Class.forName(AppOpsManager.class.getName());
Method checkOpNoThrowMethod =
appOpsClass.getMethod(CHECK_OP_NO_THROW,
Integer.TYPE, Integer.TYPE, String.class);
Field opPostNotificationValue = appOpsClass.getDeclaredField(OP_POST_NOTIFICATION);
int value = (Integer) opPostNotificationValue.get(Integer.class);
return ((Integer) checkOpNoThrowMethod.invoke(mAppOps, value, uid, pkg) ==
AppOpsManager.MODE_ALLOWED);
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
}
- 跳转到应用权限设置界面
if (!NotificationsUtils.isNotificationEnabled(this)) {
final AlertDialog dialog = new AlertDialog.Builder(this).create();
dialog.show();
View view = View.inflate(this, R.layout.dialog, null);
dialog.setContentView(view);
TextView context = (TextView) view.findViewById(R.id.tv_dialog_context);
context.setText("检测到您没有打开通知权限，是否去打开");
TextView confirm = (TextView) view.findViewById(R.id.btn_confirm);
confirm.setText("确定");
confirm.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
dialog.cancel();
Intent localIntent = new Intent();
localIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
if (Build.VERSION.SDK_INT >= 9) {
localIntent.setAction("android.settings.APPLICATION_DETAILS_SETTINGS");
localIntent.setData(Uri.fromParts("package", MainActivity.this.getPackageName(), null));
} else if (Build.VERSION.SDK_INT <= 8) {
localIntent.setAction(Intent.ACTION_VIEW);
localIntent.setClassName("com.android.settings",
"com.android.settings.InstalledAppDetails");
localIntent.putExtra("com.android.settings.ApplicationPkgName",
MainActivity.this.getPackageName());
}
startActivity(localIntent);
}
});
TextView cancel = (TextView) view.findViewById(R.id.btn_off);
cancel.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
dialog.cancel();
}
});
}
