所以我有一个服务，我试图显示一个警告对话框。这似乎是不可能的，所以我决定在我的应用程序的半透明活动中显示它。但是，我收到了这个错误：
02-01 10:29:18.336 3806-3806/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.application.sweetiean.dummylocationupdates, PID: 3806
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.application.sweetiean.dummylocationupdates/com.application.sweetiean.dummylocationupdates.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:355)
at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:324)
at android.support.v7.app.AppCompatDelegateImplV9.onPostCreate(AppCompatDelegateImplV9.java:172)
at android.support.v7.app.AppCompatActivity.onPostCreate(AppCompatActivity.java:101)
at android.app.Instrumentation.callActivityOnPostCreate(Instrumentation.java:1186)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2280)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
这是我的主要活动类：
package com.application.sweetiean.dummylocationupdates;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.LocationManager;
import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.view.ContextThemeWrapper;
import android.view.WindowManager;
import android.widget.Toast;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationServices;
import static com.application.sweetiean.dummylocationupdates.R.style.dialog;
public class MainActivity extends AppCompatActivity {
LocationManager locationManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
Toast.makeText(this, "Background Services starting...", Toast.LENGTH_SHORT).show();
// use this to start and trigger a service
Intent i= new Intent(this, LocationUpdateService.class);
/*this.startService(i);
finish();*/
// potentially add data to the intent
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
boolean enabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
// check if enabled and if not send user to the GSP settings
if (!enabled) {
showSettingsAlert();
} else {
this.startService(i);
finish();
}
//finish();
}
public void showSettingsAlert() {
//AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
AlertDialog.Builder builder = new AlertDialog.Builder(new ContextThemeWrapper(getApplication(), dialog));
builder.setTitle("GPS Settings");
builder.setMessage("GPS is not enabled. Do you want to enable it?");
//AlertDialog alert = builder.create();
builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
});
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
//stopSelf();
}
});
AlertDialog alert = builder.create();
alert.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
alert.show();
}
}
我在我的服务中使用融合位置提供程序API，我想确保用户在服务运行之前打开他们的GPS。
我已经在我的清单中有这个：<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
不是完全相关的问题，但可以获得答案 什么是Google PlayStore对全天运行定位服务的应用的政策？由于我正在使用FusedLocationProvider API，因此Playstore会拒绝我的应用程序，因为它需要GPS全天运行，无论它是在前台还是在后台，或者即使应用程序被杀死
答案 0 :(得分：1)
这样做：
AlertDialog.Builder builder = new AlertDialog.Builder(
MainActivity.this);
builder.setTitle("GPS Settings");
builder.setMessage("GPS is not enabled. Do you want to enable it?");
AlertDialog alertDialog = builder.create();
alertDialog.show();
答案 1 :(得分：1)
首先exception试试这个：
在styles.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="Theme.Transparent" parent="@style/Theme.AppCompat">
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowIsFloating">true</item>
<item name="android:backgroundDimEnabled">false</item>
</style>
将其用作：
<activity android:name=".MainActivity" android:theme="@style/Theme.Transparent">
</activity>
对于第二次查询，我认为这不会在谷歌播放中为你的应用程序造成问题..
但最佳做法是在销毁应用时停止所有后台服务
@Override
protected void onDestroy() {
super.onDestroy();
mGoogleApiClient.disconnect();
}
答案 2 :(得分：0)
从日志中
无法启动活动java.lang.IllegalStateException：您需要在此活动中使用Theme.AppCompat主题（或后代）。
尝试Theme.AppCompat主题（或后代）
同样在这种情况下避免使用融合位置而是使用位置管理器
LocationManager manager =（LocationManager）getSystemService（Context.LOCATION_SERVICE）;
manager.isProviderEnabled（LocationManager.GPS_PROVIDER）;