Activity 切换（android）

两个 activity 中相互切换，使用 Intent 对像，使用很简单

Intent in = new Intent();
        in.setClass(this,active2.class);
        // 向 active2 传值
        in.putExtra("tt", et.getText().toString());
        this.startActivity(in);
        this.finish();

详细代码

main.xml 第一个 activity用的 xml

<?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" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="这是 active 1111 " />
    <EditText 
        android:id="@+id/et1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
    <Button 
        android:id="@+id/btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="go to active2"
        />
</LinearLayout>

main2.xml 第二个 activity用的 xml

<?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" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="这是 active2 " />
     <EditText 
        android:id="@+id/et1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
    <Button 
        android:id="@+id/btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="go to active1"
        />
</LinearLayout>

activetest java代码

package zziss.android.activetest;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.view.View;
public class ActiveTestActivity extends Activity implements View.OnClickListener {
    /** Called when the activity is first created. */
    private Button btn1;
    private EditText et;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn1 = (Button)this.findViewById(R.id.btn1);
        et   = (EditText)this.findViewById(R.id.et1);
        btn1.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        Intent in = new Intent();
        in.setClass(this,active2.class);
        // 向 active2 传值
        in.putExtra("tt", et.getText().toString());
        this.startActivity(in);
        this.finish();
    }
}

active java 代码

package zziss.android.activetest;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class active2 extends Activity  implements View.OnClickListener{
    private Button btn1;
    private EditText et;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main2);
        btn1 = (Button)this.findViewById(R.id.btn1);
        et   = (EditText)this.findViewById(R.id.et1);
        Bundle data = this.getIntent().getExtras();
        
        if (data.containsKey("tt"))
            et.setText(data.getString("tt"));
        
        btn1.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        Intent in = new Intent();
        in.setClass(this,ActiveTestActivity.class);
        this.startActivity(in);
        this.finish();
    }
}