安卓学习：（3）安卓启动新的Activity并且传递参数

1.建立SecondActivity.java

package com.example.testactivity;
 
import android.R.string;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;
 
public class SecondActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  setContentView(R.layout.second);
  Button button1=(Button) findViewById(R.id.button1); 
  Intent intent=getIntent();
  String name=intent.getStringExtra("name");
  button1.setText(name);
  }
}

2.建立activity_second.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" >
 
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />
 
</LinearLayout>

3.在AndroidManifest.xml中添加新增的SecondActivity

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.testactivity"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="16" /><application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme">
        <activity android:name="com.example.testactivity.MainActivity" 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="SecondActivity"></activity>
    </application>
 
</manifest>

4.在MainActivity.java中启动activity并传递参数

public class MainActivity extends Activity {
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  Button openSecond=(Button)findViewById(R.id.openSecond);
  openSecond.setOnClickListener(new View.OnClickListener() {
    
    @Override
    public void onClick(View arg0) {
    // TODO Auto-generated method stub
    Intent intent=new Intent( MainActivity.this,SecondActivity.class);
    intent.putExtra("name", "这是前面传过来的name");
    startActivity(intent);
    
    }
  });
  }