20-activity第二步点击按钮，向第二个页面传递值

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MainActivity.java

package com.example.intent3;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.support.v4.app.NavUtils;public class MainActivity extends Activity {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);// 获取ButtonButton button = (Button) findViewById(R.id.button1);button.setOnClickListener(listener);}private OnClickListener listener = new OnClickListener() {@Overridepublic void onClick(View v) {// 创建Intent对象Intent intent = new Intent();// 设置要跳转的布局文件intent.setClass(MainActivity.this, SecondActivity.class);// 给跳转到的页面传递一个值intent.putExtra("str", "你好，安卓！这是上个页面传递的值");// 启动startActivity(intent);}};}

SecondActivity.java

package com.example.intent3;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.widget.TextView;public class SecondActivity extends Activity {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_second);// 获取MainActivity中的IntentIntent intent = getIntent();// 获取传递的值Bundle bundle = intent.getExtras();String string = bundle.getString("str");// 获取SecondActivity中的TextViewTextView textView = (TextView) findViewById(R.id.text);// 设置textView中的内容textView.setText(string);}}

activity_main.xml

<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="wrap_content"        android:layout_height="wrap_content"        android:text="firstpage"        android:textSize="30sp" />    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Button" /></LinearLayout>

activity_second.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <TextView        android:id="@+id/text"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></RelativeLayout>