[英]My application has stopped working when i start activity using intent
當我從另一個活動開始getContact活動時,應用程序已停止。 當我在mainActivity中編寫代碼時,getContact活動工作正常,這意味着不使用意圖將起作用。我也嘗試了很多解決方案,請幫助我。
這是getContact活動
package com.example.myapplication;
import android.content.Context;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;
public class getContact extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
//Bundle extras=getIntent().getExtras();
//String name=extras.getString("ContactName");
//String SenderNum=extras.getString("SenderNum");
String name="Name";
String number=get(name,getContact.this);
Toast.makeText(getApplicationContext(), "Number "+number, Toast.LENGTH_SHORT).show();
}
public String get(String name, Context context) {
String ret=null;
String selection = ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME+" like'%" + name +"%'";
String[] projection = new String[] { ContactsContract.CommonDataKinds.Phone.NUMBER};
Cursor c = context.getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
projection, selection, null, null);
if (c.moveToFirst()) {
ret = c.getString(0);
}
c.close();
if(ret==null)
ret = "Unsaved";
return ret;
}
}
我試圖使用另一個活動的以下內容來開始上述活動
Intent i=new Intent(contactActivity.this,getContact.class);
startActivity(i);
finish();
這是我開始活動時logcat的輸出
--------- beginning of crash
2019-06-12 09:26:17.399 6361-6361/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.myapplication, PID: 6361
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.getContact}: java.lang.SecurityException: Permission Denial: opening provider com.android.providers.contacts.ContactsProvider2 from ProcessRecord{386669f 6361:com.example.myapplication/u0a335} (pid=6361, uid=10335) requires android.permission.READ_CONTACTS or android.permission.WRITE_CONTACTS
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2723)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2784)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1523)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:163)
at android.app.ActivityThread.main(ActivityThread.java:6238)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:933)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
Caused by: java.lang.SecurityException: Permission Denial: opening provider com.android.providers.contacts.ContactsProvider2 from ProcessRecord{386669f 6361:com.example.myapplication/u0a335} (pid=6361, uid=10335) requires android.permission.READ_CONTACTS or android.permission.WRITE_CONTACTS
at android.os.Parcel.readException(Parcel.java:1718)
at android.os.Parcel.readException(Parcel.java:1671)
at android.app.ActivityManagerProxy.getContentProvider(ActivityManagerNative.java:4267)
at android.app.ActivityThread.acquireProvider(ActivityThread.java:5579)
at android.app.ContextImpl$ApplicationContentResolver.acquireUnstableProvider(ContextImpl.java:2280)
at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:1533)
at android.content.ContentResolver.query(ContentResolver.java:518)
at android.content.ContentResolver.query(ContentResolver.java:475)
at com.example.myapplication.getContact.get(getContact.java:27)
at com.example.myapplication.getContact.onCreate(getContact.java:19)
at android.app.Activity.performCreate(Activity.java:6857)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2676)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2784)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1523)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:163)
at android.app.ActivityThread.main(ActivityThread.java:6238)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:933)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
在查看錯誤日志后,它顯示安全異常,我相信未授予權限。
在清單文件中添加以下權限
<uses-permission android:name="android.permission.WRITE_CONTACTS" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
此外,如果您將目標定位在Marshamallow以上的設備,則需要考慮授予用戶權限。
requestPermissions(new String[]{READ_CONTACTS, WRITE_CONTACTS},PERMISSION_REQUEST_CODE);
檢查是否已授予權限
int result3 = ContextCompat.checkSelfPermission(getApplicationContext(), READ_CONTACTS);
int result4 = ContextCompat.checkSelfPermission(getApplicationContext(), WRITE_CONTACTS);
兩個值都應該為0
您並沒有增加活動的布局。 您的onCreate方法應調用setContentView(R.layout.layout_name)
如果刪除了此行,則添加並顯示應用崩潰時在Logcat中遇到的錯誤。
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