【Android开发学习20】多个Activity间的交互之Intent

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【Android开发学习20】多个Activity间的交互之Intent

2013年12月07日 ⁄ 综合 ⁄ 共 4884字 ⁄ 字号小中大 ⁄ 评论关闭

一、基础知识:

1.一个Intent对象包含了一组信息：
1. Component name 指定启动的Activity
2. Action 要做什么
3. Data 传送数据
4. Category
5. Extras 键值对
6. Flags

2.Intent基本用法:

// 生成一个Intent对象
Intent intent = new Intent();
intent.putExtra("testIntent", "123");	// 传递数据
intent.setClass(Activity_02.this, OtherActivity.class);	// 指定跳向哪一个Activity(第二个参数)
//Activity_02.this.startActivity(intent);
startActivity(intent);

// 接收Intent传过来的数据
Intent intent = getIntent();
String value = intent.getStringExtra("testIntent");	// 接收Intent的数据
myTextView = (TextView)findViewById(R.id.myTextView);
//myTextView.setText(R.string.other);
myTextView.setText(value);

3.按钮事件的注册:

private Button myButton = null;
myButton = (Button)findViewById(R.id.myButton);
myButton.setOnClickListener(new MyButtonListener());

class MyButtonListener implements OnClickListener{

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		// 生成一个Intent对象
		Intent intent = new Intent();
		intent.putExtra("testIntent", "123");	// 传递数据
		intent.setClass(Activity_02.this, OtherActivity.class);	// 指定跳向哪一个Activity(第二个参

数)
		//Activity_02.this.startActivity(intent);
		startActivity(intent);
		
		/*
		Uri uri = Uri.parse("smsto:0800000123");
		Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
		intent.putExtra("sms_body", "The SMS text");
		startActivity(intent);
		 */
	}	
}

二、代码展示:

1."Activity_02\src\yan\activity_02\Activity_02.java"

package yan.activity_02;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Activity_02 extends Activity {
	private Button myButton = null;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_02);
		myButton = (Button)findViewById(R.id.myButton);
		myButton.setOnClickListener(new MyButtonListener());
	}

	class MyButtonListener implements OnClickListener{

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			// 生成一个Intent对象
			
			Intent intent = new Intent();
			intent.putExtra("testIntent", "123");
			intent.setClass(Activity_02.this, OtherActivity.class);
			//Activity_02.this.startActivity(intent);
			startActivity(intent);
			
			/*
			Uri uri = Uri.parse("smsto:0800000123");
			Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
			intent.putExtra("sms_body", "The SMS text");
			startActivity(intent);
			 */
		}
		
	}
}

2."Activity_02\src\yan\activity_02\OtherActivity.java"

package yan.activity_02;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class OtherActivity extends Activity{
	private TextView myTextView = null;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.other);
		
		Intent intent = getIntent();
		String value = intent.getStringExtra("testIntent");
		myTextView = (TextView)findViewById(R.id.myTextView);
		//myTextView.setText(R.string.other);
		myTextView.setText(value);
	}

}

3."Activity_02\res\layout\activity_02.xml"

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

4."Activity_02\res\layout\other.xml"

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

5."Activity_02\res\values\strings.xml"

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">Activity_02</string>
    <string name="hello_world">Hello world!</string>
    <string name="menu_settings">Settings</string>
	<string name="other">other string</string>
</resources>

6.“Activity_02\AndroidManifest.xml”

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="yan.activity_02"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="4"
        android:targetSdkVersion="4" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="yan.activity_02.Activity_02"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="yan.activity_02.OtherActivity"
            android:label="@string/other" >
        </activity>
    </application>

</manifest>

注意这个文件中的activity的声明:

</activity>

三、效果展示: