負責從一個Actvity傳遞數據到另一個Activity或其它對象
傳遞的對象不一定要是程序自身的Activity,可以是系統的,或其它程序的,或服務等
2.一個Intent對象包含的一組信息
Component name:傳遞到哪個對象
Action:傳遞的動作(Intent.ACTION_??)
Data:傳遞的URI
Extras:傳遞參數(多種數據類型的鍵值對)
3.調用跳轉另一個Activity
使用startActivity(Intent)方法
4.添加監聽事件的內部類
class btnGotoActivity02Listener implements OnClickListener {
public void onClick(View v) {
Intent intent = new Intent();
intent.setClass(Activity01Activity.this, Activity02Activity.class); //從哪個對象傳遞到哪個對象
intent.putExtra("text_content", "我是一隻小小小小鳥"); //傳鍵值對
startActivity(intent); //跳轉
}
}
5.爲按鈕添加監聽事件
btnGotoActivity02 = (Button) findViewById(R.id.btnGotoActivity02);
btnGotoActivity02.setOnClickListener(new btnGotoActivity02Listener());
6.使用Intent打開短信發送界面
class btnSendSmsListener implements OnClickListener {
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_SENDTO, Uri.parse("smsto:13800138000")); //SENDTO調用短信界面
intent.putExtra("sms_body", "親,我想你了……"); //短信內容
startActivity(intent);
}
}
7.另一個Activity中接收Intent傳遞過來的鍵值對
Intent intent = getIntent();
txtActivity02 = (TextView) findViewById(R.id.txtActivity02);
txtActivity02.setText(intent.getStringExtra("text_content"));
//完整佈局示例
<?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" >
<Button
android:id="@+id/btnGotoActivity02"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/btnGotoActivity02" />
<Button
android:id="@+id/btnSendSms"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/btnSendSms" />
</LinearLayout>
//完整類示例
public class Activity01Activity extends Activity {
/** Called when the activity is first created. */
Button btnGotoActivity02 = null;
Button btnSendSms = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity01);
btnGotoActivity02 = (Button) findViewById(R.id.btnGotoActivity02);
btnGotoActivity02.setOnClickListener(new btnGotoActivity02Listener());
btnSendSms = (Button) findViewById(R.id.btnSendSms);
btnSendSms.setOnClickListener(new btnSendSmsListener());
}
// 內部類:btnGotoActivity02點擊事件監聽
class btnGotoActivity02Listener implements OnClickListener {
public void onClick(View v) {
Intent intent = new Intent();
intent.setClass(Activity01Activity.this, Activity02Activity.class);
intent.putExtra("text_content", "我是一隻小小小小鳥");
startActivity(intent);
}
}
// 內部類:btnSendSms點擊事件監聽
class btnSendSmsListener implements OnClickListener {
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_SENDTO, Uri.parse("smsto:13800138000"));
intent.putExtra("sms_body", "親,我想你了……");
startActivity(intent);
}
}
}