Android开发入门之为应用添加多个Activity与参数传递

第一步:新建一个Android工程命名为MultiAcitivty目录结构如下图:



第二步:修改activity_main.xml布局文件代码如下:

<LinearLayout 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"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="startActivity"
        android:text="@string/start_activity" />

</LinearLayout>


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

    <string name="app_name">MultiActivity</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="start_activity">打开一个新的Activity</string>
    <string name="other_activity">新的Activity</string>
    <string name="this_is_a_new_activity">这是一个新的Activity</string>
    <string name="go_back">返回</string>

</resources>



第三步：新建一个OtherActivity.java。
package cn.leigo.multiactivity;

import android.app.Activity;
import android.os.Bundle;

public class OtherActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_other);
}

}

activity_other.xml:

<LinearLayout 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"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/this_is_a_new_activity" />

    <TextView
        android:id="@+id/tv_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/tv_age"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/go_back"
        android:onClick="goBack"/>

</LinearLayout>


第四步：在AndroidManifest.xml文件中注册该Activity:

<activity
android:name="cn.leigo.multiactivity.OtherActivity"
android:label="@string/other_activity" />

第五步：编写MainActivity类：
package cn.leigo.multiactivity;

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

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

public void startActivity(View v) {
Intent intent = new Intent(this, OtherActivity.class);

// Intent intent = new Intent();
// intent.setClass(this, OtherActivity.class);//设置要激活的组建

// Intent intent = new Intent();
// intent.setClassName(this, "cn.leigo.multiactivity.OtherActivity");

// Intent intent = new Intent();
// intent.setClassName("cn.leigo.multiactivity",
// "cn.leigo.multiactivity.OtherActivity");

// Intent intent = new Intent();
// intent.setComponent(new ComponentName(this, OtherActivity.class));

//传值
// intent.putExtra("name", "leigo");
// intent.putExtra("age", 23);

Bundle bundle = new Bundle();
bundle.putString("name", "高磊");
bundle.putInt("age", 23);
intent.putExtras(bundle);
// startActivity(intent);
startActivityForResult(intent, 1);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
String blog = data.getStringExtra("blog");
Toast.makeText(this, blog, Toast.LENGTH_SHORT).show();
}

}


第六步：重新编写OtherActivity类：
package cn.leigo.multiactivity;

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

public class OtherActivity extends Activity {
private TextView mNameText;
private TextView mAgeText;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_other);

Intent intent = getIntent(); // 用于激活它的意图对象
//String name = intent.getStringExtra("name");
//int age = intent.getIntExtra("age", 0);

Bundle bundle = intent.getExtras();
String name = bundle.getString("name");
int age = bundle.getInt("age", 0);

mNameText = (TextView)findViewById(R.id.tv_name);
mAgeText = (TextView)findViewById(R.id.tv_age);
mNameText.setText("姓名： " + name);
mAgeText.setText("年龄：" + age);
}

public void goBack(View v) {
Intent data = new Intent();
data.putExtra("blog", "http://blog.csdn.net/u011272454");
setResult(RESULT_OK, data); //设置返回的数据
this.finish(); //关闭当前Activity
}

}