开启新的activity获取它的返回值

1、开始界面

<LinearLayout ="http://schemas.android.com/apk/res/android"  ="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical"  tools:context=".MainActivity" >  <LinearLayout     android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:orientation="horizontal"    >    <EditText      android:id="@+id/et_number"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:hint="请输入联系人" />    <Button       android:onClick="click"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="联系人"      />  </LinearLayout>   <LinearLayout     android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:orientation="horizontal"    >    <EditText      android:id="@+id/et_number2"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:hint="请输入联系人" />    <Button       android:onClick="click2"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="联系人2"      />  </LinearLayout></LinearLayout>

2、开启新的activity代码

 1 package com.example.smssender; 2  3 import android.os.Bundle; 4 import android.app.Activity; 5 import android.content.Intent; 6 import android.view.Menu; 7 import android.view.View; 8 import android.widget.EditText; 9 10 public class MainActivity extends Activity {11 12   private EditText et_number;13   private EditText et_number2;14   @Override15   protected void onCreate(Bundle savedInstanceState) {16     super.onCreate(savedInstanceState);17     setContentView(R.layout.activity_main);18     et_number = (EditText) findViewById(R.id.et_number);19     et_number2 = (EditText) findViewById(R.id.et_number2);20   }21 22   public void click(View view){23     Intent intent = new Intent(this, ContactActivity.class);24     //startActivity(intent);25     //请求码的作用是区别是谁发起的请求26     startActivityForResult(intent, 1);27   }28   29   public void click2(View view){30     Intent intent = new Intent(this, ContactActivity.class);31     //startActivity(intent);32     //请求码的作用是区别是谁发起的请求33     startActivityForResult(intent, 2);34   }35   36   37   @Override38   protected void onActivityResult(int requestCode, int resultCode, Intent data) {39     // TODO Auto-generated method stub40     super.onActivityResult(requestCode, resultCode, data);41     if(data != null){42       String number = data.getStringExtra("number");43       if(requestCode == 1){44         et_number.setText(number);45       }else{46         et_number2.setText(number);47       }48     }49   }50 51 }

3、获取联系人

      1)清单文件

　　<uses-permission android:name="android.permission.READ_CONTACTS"/>//权限

      2)通过内容提供者获取联系人

 1 package com.example.smssender; 2  3 import java.util.ArrayList; 4 import java.util.List; 5  6 import android.content.ContentResolver; 7 import android.content.Context; 8 import android.database.Cursor; 9 import android.net.Uri;10 11 public class ContactService {12   public static List<contactInfo> getContactAll(Context context){13     List<contactInfo> infos = new ArrayList<contactInfo>();14     //通过内容提供者获取联系人15     ContentResolver resolver = context.getContentResolver();16     Uri uri = Uri.parse("content://com.android.contacts/raw_contacts");17     Uri dataUri = Uri.parse("content://com.android.contacts/data");18     Cursor cursor = resolver.query(uri, null, null, null, null);19     while(cursor.moveToNext()){20       String id = cursor.getString(cursor.getColumnIndex("contact_id"));21       Cursor datacursor = resolver.query(dataUri, null, "raw_contact_id=?", new String[]{id}, null);22       contactInfo info = new contactInfo();23       while(datacursor.moveToNext()){24         String data1 = datacursor.getString(datacursor.getColumnIndex("data1"));25         String mimetype = datacursor.getString(datacursor.getColumnIndex("mimetype"));26         if("vnd.android.cursor.item/name".equals(mimetype)){27           info.setUsername(data1);28         }else if("vnd.android.cursor.item/phone_v2".equals(mimetype)){29           info.setNumber(data1);30         }31       }32       33       infos.add(info);34       35     }36     return infos;37   }38 }

4、设置联系人进Listview

 1 <??> 2 <LinearLayout ="http://schemas.android.com/apk/res/android" 3   android:layout_width="match_parent" 4   android:layout_height="match_parent" 5   android:orientation="vertical" > 6    7   <ListView 8     android:layout_width="match_parent" 9     android:layout_height="match_parent" 10     android:id="@+id/lv_contact"11     ></ListView>12 13 </LinearLayout>

 1 <??> 2 <LinearLayout ="http://schemas.android.com/apk/res/android" 3   android:layout_width="match_parent" 4   android:layout_height="match_parent" 5   android:orientation="vertical" > 6    7   <TextView  8     android:id="@+id/et_username" 9     android:layout_width="match_parent"10     android:layout_height="wrap_content"11     />12   <TextView 13     android:id="@+id/et_number"14     android:layout_width="match_parent"15     android:layout_height="wrap_content"16     />17 18 </LinearLayout>

java代码:

 1 package com.example.smssender; 2  3 import java.util.List; 4  5 import android.app.Activity; 6 import android.content.ContentResolver; 7 import android.content.Intent; 8 import android.database.Cursor; 9 import android.net.Uri;10 import android.os.Bundle;11 import android.view.View;12 import android.view.ViewGroup;13 import android.widget.AdapterView;14 import android.widget.AdapterView.OnItemClickListener;15 import android.widget.BaseAdapter;16 import android.widget.ListView;17 import android.widget.TextView;18 19 public class ContactActivity extends Activity {20 21   private ListView lv_contact;22   private List<contactInfo> infos = null;23   @Override24   protected void onCreate(Bundle savedInstanceState) {25     26     // TODO Auto-generated method stub27     super.onCreate(savedInstanceState);28     setContentView(R.layout.activity_contact);29     30     infos = ContactService.getContactAll(this);31     32     lv_contact = (ListView)findViewById(R.id.lv_contact);33     lv_contact.setAdapter(new ContactAdapter());34     35     lv_contact.setOnItemClickListener(new OnItemClickListener() {36 37       @Override38       public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,39           long arg3) {40         // TODO Auto-generated method stub41         contactInfo info = infos.get(arg2);42         String number = info.getNumber();43         Intent data = new Intent();44         data.putExtra("number", number);45         setResult(0, data);46         //关闭当前activity,把数据传回给它的激活者47         finish();48         49       }50       51     });52   }53   54   private class ContactAdapter extends BaseAdapter{55 56     @Override57     public int getCount() {58       // TODO Auto-generated method stub59       return infos.size();60     }61 62     @Override63     public Object getItem(int arg0) {64       // TODO Auto-generated method stub65       return null;66     }67 68     @Override69     public long getItemId(int arg0) {70       // TODO Auto-generated method stub71       return 0;72     }73 74     @Override75     public View getView(int arg0, View arg1, ViewGroup arg2) {76       // TODO Auto-generated method stub77       contactInfo info = infos.get(arg0);78       View view = View.inflate(ContactActivity.this, R.layout.contact_item, null);79       TextView et_username = (TextView)view.findViewById(R.id.et_username);80       et_username.setText(info.getUsername());81       82       TextView et_number = (TextView)view.findViewById(R.id.et_number);83       et_number.setText(info.getNumber());    84       85       return view;86     }87     88   }89 90 }

原标题：开启新的activity获取它的返回值

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