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:
[java] view plaincopyprint?// 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);
// 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);
[java]
// 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);
// 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:
[java]
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);
*/
}
}
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"
[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);
*/
}
}
}
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"
[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);
}
}
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"
[java]
<?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>
<?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"
[java]
<?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>
<?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"
[java]
<?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>
<?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”
[java] view plaincopyprint?<?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>
<?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 android:name="yan.activity_02.OtherActivity"
android:label="@string/other" >
</activity>
三、效果展示:
点击上面的Button之后-->> 跳转到另一个Activity。
