我创建了一个 Android 应用程序，可以在 OS v6.0/6.01 (Marshmallow) 上正常运行。当我在 OS v7.1 (Nougat) 上尝试它时，由于 WRITE_SETTINGS 要求，它崩溃了。添加添加的代码后，修改系统设置的屏幕会在 v6.0 中显示，但呈灰色。 v7.1 也会发生同样的情况，只是应用程序首先崩溃。
onCreate方法
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
//***added code***
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (!Settings.System.canWrite(getApplicationContext())) {
Intent intent = new Intent(android.provider.Settings.ACTION_MANAGE_WRITE_SETTINGS);
intent.setData(Uri.parse("package:" + getApplicationContext().getPackageName()));
startActivity(intent);
}
}
if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
REQUEST_CODE_ASK_PERMISSIONS);
}
if (android.provider.Settings.System.getInt(getContentResolver(),
Settings.System.ACCELEROMETER_ROTATION, 0) == 1) {
android.provider.Settings.System.putInt(getContentResolver(),
Settings.System.ACCELEROMETER_ROTATION, 0);
}
start = (Button) findViewById(R.id.button_start);
start.setEnabled(true);
stop = (Button) findViewById(R.id.button_stop);
stop.setEnabled(true);
confirm_ip = (Button) findViewById(R.id.button_confirm_ip);
confirm_ip.setEnabled(true);
confirm_ip.setOnClickListener(this);
grab_device = (Button) findViewById(R.id.button_device);
grab_device.setEnabled(true);
grab_device.setOnClickListener(this);
send = (Button) findViewById(R.id.button_send);
send.setEnabled(false);
send.setOnClickListener(this);
clear_loc = (Button) findViewById(R.id.button_cl);
clear_loc.setEnabled(true);
clear_loc.setOnClickListener(this);
device_name = (EditText) findViewById(R.id.et_device_name);
device_name.setEnabled(true);
location = (EditText) findViewById(R.id.et_location);
location.setEnabled(true);
scenario = (EditText) findViewById(R.id.et_scenario);
scenario.setEnabled(true);
distance = (EditText) findViewById(R.id.et_distance);
distance.setEnabled(true);
server_ip = (EditText) findViewById(R.id.et_server_ip);
server_ip.setEnabled(true);
server_ip.setText(R.string.server_ip);
mAppStatus = (TextView) findViewById(R.id.tv_app_status);
scenario_spinner = (Spinner) findViewById(R.id.spinner_scenario);
scenario_spinner.setOnItemSelectedListener(this);
ArrayAdapter<CharSequence> adp_scenario = ArrayAdapter.createFromResource(this, R.array.scenario_array,
android.R.layout.simple_spinner_item);
adp_scenario.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
scenario_spinner.setAdapter(adp_scenario);
distance_spinner = (Spinner) findViewById(R.id.spinner_distance);
distance_spinner.setOnItemSelectedListener(this);
ArrayAdapter<CharSequence> adp_distance = ArrayAdapter.createFromResource(this, R.array.distance_array,
android.R.layout.simple_spinner_item);
adp_distance.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
distance_spinner.setAdapter(adp_distance);
handler = new Handler(Looper.getMainLooper());
}
AndroidManifext.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.rssicollector">
<user-permission android:name="android.permission.WRITE_SETTINGS"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
这是 v7.1 产生的错误
08-10 09:51:19.002 31732-31732/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.android.rssicollector, PID: 31732
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.android.rssicollector/com.example.android.rssicollector.MainActivity}: java.lang.SecurityException: com.example.android.rssicollector was not granted this permission: android.permission.WRITE_SETTINGS.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2666)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2727)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1478)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6121)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
Caused by: java.lang.SecurityException: com.example.android.rssicollector was not granted this permission: android.permission.WRITE_SETTINGS.
at android.os.Parcel.readException(Parcel.java:1684)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:183)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135)
at android.content.ContentProviderProxy.call(ContentProviderNative.java:646)
at android.provider.Settings$NameValueCache.putStringForUser(Settings.java:1595)
at android.provider.Settings$System.putStringForUser(Settings.java:1965)
at android.provider.Settings$System.putIntForUser(Settings.java:2070)
at android.provider.Settings$System.putInt(Settings.java:2064)
at com.example.android.rssicollector.MainActivity.onCreate(MainActivity.java:132)
at android.app.Activity.performCreate(Activity.java:6682)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2619)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2727)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1478)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6121)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
关于发生了什么/如何解决它有什么想法吗？任何帮助将不胜感激!
最佳答案
if (android.provider.Settings.System.getInt(getContentResolver(),
Settings.System.ACCELEROMETER_ROTATION, 0) == 1) {
android.provider.Settings.System.putInt(getContentResolver(),
Settings.System.ACCELEROMETER_ROTATION, 0);
}
仅当 Settings.System.canWrite(getApplicationContext()) 返回 true 时才执行该代码。现在，无论 canWrite() 返回什么，您都会执行该代码。
关于java - 尽管有 WRITE_SETTINGS 权限代码，应用程序在 Android OS v7.1 中仍会崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45614517/