Intent回传值
Intent回传值：启动一个Activity，当启动的Activity关闭时，传回值回到原Activity。以下一个小程序演示回传值。
package com.itheima.smshelper;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
private EditText et_content;
private EditText et_number;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_content = (EditText) findViewById(R.id.et_content);
et_number = (EditText) findViewById(R.id.et_number);
}
public void selectSms(View view) {
Intent intent = new Intent(this, ListSmsActivity.class);
// 开启一个新的界面，并且获取界面的返回值
// startActivity(intent);
// int requestCode 请求码
startActivityForResult(intent, 0);
}
public void selectNumber(View view) {
Intent intent = new Intent(this, ListNumberActivity.class);
// 开启一个新的界面，并且获取界面的返回值
// startActivity(intent);
// int requestCode 请求码
startActivityForResult(intent, 1);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (data != null) {
String smsinfo = data.getStringExtra("smsinfo");
if (resultCode == 0) {
et_content.setText(smsinfo);
} else if (resultCode == 1) {
et_number.setText(smsinfo);
}
}
super.onActivityResult(requestCode, resultCode, data);
}
public void sendSms(View view){
String content = et_content.getText().toString().trim();
String number = et_number.getText().toString().trim();
SmsManager.getDefault().sendTextMessage(number, null, content, null, null);
Toast.makeText(this, "发送成功", 0).show();
}
}
package com.itheima.smshelper;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class ListNumberActivity extends Activity {
private ListView lv;
private String[] objects = {
"1234","34324","5643543","32424" };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sms);
lv = (ListView) findViewById(R.id.lv);
lv.setAdapter(new ArrayAdapter
R.id.tv_info, objects));
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView parent, View view,
int position, long id) {
String smsinfo = objects[position];
Intent data = new Intent();
data.putExtra("smsinfo", smsinfo);
//设置数据。
setResult(1, data);
//关闭掉当前的activity，并且回传数据 onActivityResult().
finish();
}
});
}
}
package com.itheima.smshelper;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class ListSmsActivity extends Activity {
private ListView lv;
private String[] objects = {
"玫瑰香香，情人黏黏，情话甜甜，情歌绵绵；花灯灿灿，礼花点点，好运连连，好梦圆圆。情人节喜逢元宵节，喜鹊登枝蝴蝶成双鸳鸯成对双喜临门祝双节快乐，合家团团圆圆，甜甜蜜蜜，开开心心，幸幸福福",
"情人节快到了，我精心挑选玫瑰花、百合花和满天星，扎成一束鲜花随短信送给你，火红的玫瑰代表热烈奔放，洁白的百合代表百年好合，小小的满天星代表幸福美好。愿你的情人节热烈奔放，你们的爱情百年好合，你们的生活幸福美满。预祝情人节快乐",
"^o^满天星光，最爱你许过愿望的那一颗，鲜花绽放，最爱你摘下微笑的那一朵，曼妙旋律，最爱你感动落泪的那一段，亲爱的，情人节快乐，爱你。 ",
"^o^宝贝，情人节到了，送你一束玫瑰，用真心塑料纸包扎，系上快乐彩带，喷点爱的香水，插一张真情卡片，写着：宝贝，愿我的爱能带给你一生的快乐！" };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sms);
lv = (ListView) findViewById(R.id.lv);
lv.setAdapter(new ArrayAdapter
R.id.tv_info, objects));
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView parent, View view,
int position, long id) {
String smsinfo = objects[position];
Intent data = new Intent();
data.putExtra("smsinfo", smsinfo);
//设置数据。
setResult(0, data);
//关闭掉当前的activity，并且回传数据 onActivityResult().
finish();
}
});
}
}
主界面
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入电话号码" />
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入短信的内容"
android:inputType="textMultiLine"
android:lines="5" />
android:layout_height="wrap_content"
android:onClick="selectSms"
android:text="选择短信" />
android:layout_height="wrap_content"
android:onClick="selectNumber"
android:text="选择电话号码" />
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="发送短信" />
可选短信
android:layout_height="match_parent"
android:orientation="vertical" >
android:layout_width="match_parent"
android:layout_height="match_parent" >
ListView的Item布局
android:layout_height="wrap_content"
android:orientation="vertical" >
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:drawableLeft="@android:drawable/star_big_on"
android:gravity="center_vertical"
android:text="我爱你。" />