java.lang.SecurityException: com.example.rxtest was not granted this permission: android.permission

1. 错误描述

java.lang.SecurityException: com.example.rxtest was not granted this permission: android.permission.WRITE_SETTINGS.

java.lang.SecurityException: com.example.rxtest was not granted  this permission: android.permission.WRITE_SETTINGS.at android.os.Parcel.createException(Parcel.java:1950)at android.os.Parcel.readException(Parcel.java:1918)at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:241)

2. 错误原因

使用WRITE_SETTINGS向系统写入数据时，需要打开系统允许应用修改设置；

3. 解决方案

先判断当前应用是否可以向系统写入数据，不可以跳转修改系统设置界面；

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {//判断是否可以写入数据到系统if (!Settings.System.canWrite(context)) {Intent i = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS);i.setData(Uri.parse("package:" + context.getPackageName()));i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);context.startActivity(i);} else {   ...//处理逻辑}} else {...//处理逻辑}

4. 案例：修改休眠时间15秒

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {//判断是否可以写入数据到系统if (!Settings.System.canWrite(context)) {Intent i = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS);i.setData(Uri.parse("package:" + context.getPackageName()));i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);context.startActivity(i);} else {  Settings.System.putInt(context.getContentResolver(), Settings.System.SCREEN_OFF_TIMEOUT, 15*1000);}} else {Settings.System.putInt(context.getContentResolver(), Settings.System.SCREEN_OFF_TIMEOUT,  15*1000);}

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java.lang.SecurityException: com.example.rxtest was not granted this permission: android.permission

1. 错误描述

2. 错误原因

3. 解决方案

4. 案例：修改休眠时间15秒

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