Android開發入門之為應用添加多個Activity與參數傳遞

第一步:新建一個android工程命名為MultiAcitivty目錄結構如下圖:

第二步:修改activity_main.xml布局文件代碼如下:

<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">打開一個新的Activity</string>
    <string name="other_activity">新的Activity</string>
    <string name="this_is_a_new_activity">這是一個新的Activity</string>
    <string name="go_back">返回</string>

</resources>

第三步：新建一個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文件中註冊該Activity:

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

第五步：編寫MainActivity類：

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);//設置要激活的組建
		
		// 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));

		//傳值
		// 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：重新編寫OtherActivity類：

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(); // 用於激活它的意圖對象
		//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("年齡：" + age);
	}
	
	public void goBack(View v) {
		Intent data = http://www.xuebuyuan.com/new Intent();
		data.putExtra("blog", "http://blog.csdn.net/u011272454");
		setResult(RESULT_OK, data); //設置返回的數據
		this.finish(); //關閉當前Activity
	}

}

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