Android(安卓)启动activity并且获取他的返回值

DemoActivity.java:

package cn.itcast.getdata;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.EditText;public class DemoActivity extends Activity {EditText et, et2;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);et = (EditText) this.findViewById(R.id.et_contact1);et2 = (EditText) this.findViewById(R.id.et_contact2);}public void click(View view) {Intent intent = new Intent(this, ContactActivity.class);// startActivity(intent); 1 为请求码startActivityForResult(intent, 1);}public void click2(View view) {Intent intent = new Intent(this, ContactActivity.class);// startActivity(intent); 2 为请求码startActivityForResult(intent, 2);}/** * 当被激活的activity 使用完毕 销毁的时候 就会执行onActivityresult的方法 */@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {// TODO Auto-generated method stubSystem.out.println("结果码为" + resultCode);super.onActivityResult(requestCode, resultCode, data);if (data != null) {String name = data.getStringExtra("name");if (requestCode == 1) {et.setText(name);} else if (requestCode == 2) {et2.setText(name);}}}}

ContactActivity.java:

package cn.itcast.getdata;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.content.Intent;import android.database.Cursor;import android.graphics.Color;import android.net.Uri;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.ListView;import android.widget.TextView;public class ContactActivity extends Activity {ListView lv;List<String> names;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.contact);lv = (ListView) this.findViewById(R.id.lv);names = getContacts();lv.setAdapter(new MyAdapter());lv.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {TextView tv = (TextView) view;String name = tv.getText().toString();Intent data = new Intent();data.putExtra("name", name);// 3 为结果码setResult(3, data);// 可以把当前的activity给结束掉finish();}});}private class MyAdapter extends BaseAdapter {@Overridepublic int getCount() {// TODO Auto-generated method stubreturn names.size();}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {TextView tv = new TextView(ContactActivity.this);tv.setTextSize(28);tv.setTextColor(Color.RED);tv.setText(names.get(position));return tv;}}private List<String> getContacts() {String rawbase = "content://com.android.contacts/raw_contacts";String database = "content://com.android.contacts/data";Cursor cursor = this.getContentResolver().query(Uri.parse(rawbase),null, null, null, null);List<String> names = new ArrayList<String>();while (cursor.moveToNext()) {String id = cursor.getString(cursor.getColumnIndex("_id"));System.out.println("id =" + id);Cursor datacursor = this.getContentResolver().query(Uri.parse(database), null, "raw_contact_id=?",new String[] { id }, null);while (datacursor.moveToNext()) {String type = datacursor.getString(datacursor.getColumnIndex("mimetype"));if ("vnd.android.cursor.item/name".equals(type)) {String data1 = datacursor.getString(datacursor.getColumnIndex("data1"));names.add(data1);}}datacursor.close();}cursor.close();return names;}}

contact.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <ListView        android:id="@+id/lv"        android:layout_width="match_parent"        android:layout_height="match_parent" >    </ListView></LinearLayout>

main.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="选择联系人" />    <EditText        android:id="@+id/et_contact1"        android:layout_width="fill_parent"        android:layout_height="wrap_content" />    <Button        android:layout_width="fill_parent"        android:layout_height="wrap_content"         android:onClick="click"        android:text="选择第一个联系人"        >    </Button>        <EditText        android:id="@+id/et_contact2"        android:layout_width="fill_parent"        android:layout_height="wrap_content" />    <Button        android:layout_width="fill_parent"        android:layout_height="wrap_content"         android:onClick="click2"        android:text="选择第二个联系人"        >    </Button></LinearLayout>

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="cn.itcast.getdata"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk android:minSdkVersion="8" />    <uses-permission android:name="android.permission.READ_CONTACTS" />    <uses-permission android:name="android.permission.WRITE_CONTACTS" />    <application        android:icon="@drawable/ic_launcher"        android:label="@string/app_name" >        <activity            android:label="@string/app_name"            android:name=".DemoActivity" >            <intent-filter >                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity             android:label="选择联系人"            android:name=".ContactActivity"            ></activity>    </application></manifest>

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