获得无线扫描结果时SecurityException异常 [英] SecurityException when getting Wifi Scan Results
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问题描述
我与Android工作室上的应用程序，当我按下按钮，给我的wifi扫描结果的工作！
如果我独自试code（只有部分无线扫描），它的工作原理...但是，当我把它完整的应用程序，该应用程序crashs！
为什么？
我后我的code：
I'm working with Android Studio on an app that, when I push a button, gives me the results of wifi scan! If I test the code alone (only the part "wifi scan") it works... But when I put it in the complete app, the app crashs! Why? I post my code:
// MAIN
package com.example.pc1.tesiprova;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity
{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//CERCO GLI ELEMENTI BUTTON E BUTTON2
Button OutDoor = (Button) findViewById(R.id.button);
Button InDoor = (Button) findViewById(R.id.button2);
//CLICCANDO SU BUTTON FACCIO APRIRE UNA NUOVA ACTIVITY
OutDoor.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
//DEFINISCO L'INTENZIONE DI APRIRE UNA NUOVA ACTIVITY
Intent openActivityO=new Intent(MainActivity.this,ActivityO.class);
//APRO L'ACTIVITY ACTIVITYO.JAVA
startActivity(openActivityO);
}
});
//CLICCANDO SU BUTTON2 FACCIO APRIRE UNA NUOVA ACTIVITY
InDoor.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Intent openActivityI=new Intent(MainActivity.this,ActivityI.class);
startActivity(openActivityI);
}
});
}
// ACTIVITYO（包含无线扫描！）
//ACTIVITYO (that contains wifi scan!)
package com.example.pc1.tesiprova;
import android.content.Context;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import java.util.List;
public class ActivityO extends AppCompatActivity {
public WifiManager wifi;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_o);
TextView text1 = (TextView)findViewById(R.id.textView);
TextView text2 = (TextView)findViewById(R.id.textView2);
TextView text3 = (TextView)findViewById(R.id.textView3);
wifi=(WifiManager)getSystemService(Context.WIFI_SERVICE);
for(int i=0;i<5;i++);
wifi.startScan();
try{
text1.setText("Sto cercando");
Thread.sleep(3333);
}
catch(InterruptedException e)
{
e.printStackTrace();
}
List<ScanResult> results = wifi.getScanResults();
String ssid1= results.get(0).SSID;
String ssid2= results.get(1).SSID;
String ssid3= results.get(2).SSID;
Integer rssi1= results.get(0).level;
Integer rssi2= results.get(1).level;
Integer rssi3= results.get(2).level;
text1.setText(ssid1+rssi1);
text2.setText(ssid2+rssi2);
text3.setText(ssid3+rssi3);
和的错误是：
10-23 08:30:04.257 2230-2230/com.example.pc1.tesiprova I/art﹕ Not late-enabling -Xcheck:jni (already on)
10-23 08:30:04.257 2230-2230/com.example.pc1.tesiprova I/art﹕ Late-enabling JIT
10-23 08:30:04.259 2230-2230/com.example.pc1.tesiprova I/art﹕ JIT created with code_cache_capacity=2MB compile_threshold=1000
10-23 08:30:04.867 2230-2230/com.example.pc1.tesiprova W/System﹕ ClassLoader referenced unknown path: /data/app/com.example.pc1.tesiprova-1/lib/x86
10-23 08:30:05.276 2230-2252/com.example.pc1.tesiprova D/OpenGLRenderer﹕ Use EGL_SWAP_BEHAVIOR_PRESERVED: true
10-23 08:30:05.286 2230-2230/com.example.pc1.tesiprova D/﹕ HostConnection::get() New Host Connection established 0xac07fda0, tid 2230
10-23 08:30:05.459 2230-2252/com.example.pc1.tesiprova D/﹕ HostConnection::get() New Host Connection established 0xac07feb0, tid 2252
10-23 08:30:05.507 2230-2252/com.example.pc1.tesiprova I/OpenGLRenderer﹕ Initialized EGL, version 1.4
10-23 08:30:05.576 2230-2252/com.example.pc1.tesiprova W/EGL_emulation﹕ eglSurfaceAttrib not implemented
10-23 08:30:05.576 2230-2252/com.example.pc1.tesiprova W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xac130fc0, error=EGL_SUCCESS
10-23 08:31:14.500 2230-2252/com.example.pc1.tesiprova W/EGL_emulation﹕ eglSurfaceAttrib not implemented
10-23 08:31:14.500 2230-2252/com.example.pc1.tesiprova W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xac13f560, error=EGL_SUCCESS
10-23 08:31:14.812 2230-2252/com.example.pc1.tesiprova E/Surface﹕ getSlotFromBufferLocked: unknown buffer: 0xac0763b0
10-23 08:31:14.819 2230-2252/com.example.pc1.tesiprova D/OpenGLRenderer﹕ endAllStagingAnimators on 0xa42e1280 (RippleDrawable) with handle 0xac12fbd0
10-23 08:31:16.517 2230-2252/com.example.pc1.tesiprova W/EGL_emulation﹕ eglSurfaceAttrib not implemented
10-23 08:31:16.517 2230-2252/com.example.pc1.tesiprova W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xad9c7840, error=EGL_SUCCESS
10-23 08:31:17.043 2230-2230/com.example.pc1.tesiprova I/Choreographer﹕ Skipped 30 frames! The application may be doing too much work on its main thread.
10-23 08:31:17.119 2230-2252/com.example.pc1.tesiprova E/Surface﹕ getSlotFromBufferLocked: unknown buffer: 0xac076c00
10-23 08:31:18.646 2230-2242/com.example.pc1.tesiprova I/art﹕ Background sticky concurrent mark sweep GC freed 9604(599KB) AllocSpace objects, 0(0B) LOS objects, 53% free, 1148KB/2MB, paused 1.649ms total 139.305ms
10-23 08:31:18.671 2230-2242/com.example.pc1.tesiprova W/art﹕ Suspending all threads took: 24.989ms
10-23 08:31:22.070 2230-2230/com.example.pc1.tesiprova D/AndroidRuntime﹕ Shutting down VM
--------- beginning of crash
10-23 08:31:22.093 2230-2230/com.example.pc1.tesiprova E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.pc1.tesiprova, PID: 2230
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.pc1.tesiprova/com.example.pc1.tesiprova.ActivityO}: java.lang.SecurityException: Need ACCESS_COARSE_LOCATION or ACCESS_FINE_LOCATION permission to get scan results
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.SecurityException: Need ACCESS_COARSE_LOCATION or ACCESS_FINE_LOCATION permission to get scan results
at android.os.Parcel.readException(Parcel.java:1599)
at android.os.Parcel.readException(Parcel.java:1552)
at android.net.wifi.IWifiManager$Stub$Proxy.getScanResults(IWifiManager.java:1066)
at android.net.wifi.WifiManager.getScanResults(WifiManager.java:1311)
at com.example.pc1.tesiprova.ActivityO.onCreate(ActivityO.java:44)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
10-23 08:31:24.168 2230-2230/? I/Process﹕ Sending signal. PID: 2230 SIG: 9
我已经使用这些权限：
I have used these permissions:
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
非常感谢你!!!!
Thank you very much!!!!
推荐答案
这可能是你正在测试在Android 6.0的应用程序（例如，在模拟器）。在你需要问在运行时允许这种情况下，它是不够的声明它体现。
It is possible that you are testing the application on Android 6.0 (for example in emulator). In that case you need to ask for the permission at runtime, it is not sufficient to declare it in manifest.
您需要检查权限被授予（这不是复制粘贴code你，你需要调整您的需求）：
You need to check if the permission was granted (this is not a copy-paste code for you, you need to adjust it for your needs):
if (ContextCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION))
== PackageManager.PERMISSION_GRANTED) {
//your code that requires permission
}
为了征得他的许可，您需要使用此code：
In order to ask for permission you need to use this code:
ActivityCompat.requestPermissions(activity, new String[] { Manifest.permission.ACCESS_COARSE_LOCATION },
REQUEST_CODE);
有关详细信息，查看开发人员指南： http://developer.android.com/training /permissions/requesting.html
For more details check developer guide: http://developer.android.com/training/permissions/requesting.html
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