android組件通訊 Intent-ComponnentName屬性

ComponnentName屬性應用實例

/Chapter06_Intent_ComponentName/src/com/amaker/ch06/app/MainActivity.java 

package com.amaker.ch06.app;

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

/**
 * 測試Intent的ComponentName屬性
 */
public class MainActivity extends Activity {
    private Button btn;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 設置視圖布局
        setContentView(R.layout.main);
        // 實例化Button
        btn = (Button)findViewById(R.id.myButton01);
        // 添加單擊監聽器
        btn.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // 實例化組件名稱
                ComponentName cn = new ComponentName(MainActivity.this, "com.amaker.ch06.app1.MyActivity");
                // 實例化Intent
                Intent intent = new Intent();
                // 為Intent設置組件名稱屬性
                intent.setComponent(cn);
                // 啟動Activity
                startActivity(intent);
            }
        });
    }
}

/Chapter06_Intent_ComponentName/src/com/amaker/ch06/app1/MyActivity.java

package com.amaker.ch06.app1;

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

import com.amaker.ch06.app.R;

/**
 * 測試Intent的ComponentName屬性
 */
public class MyActivity extends Activity {
    // 聲明TextView
    private TextView tv;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        // 設置視圖布局
        super.onCreate(savedInstanceState);
        setContentView(R.layout.my_layout);
        // 獲得Intent
        Intent intent = this.getIntent();
        // 獲得組件名稱對象
        ComponentName cn = intent.getComponent();
        // 獲得包名稱
        String packageName = cn.getPackageName();
        // 獲得類名稱
        String className = cn.getClassName();
        // 實例化TextView
        tv = (TextView)findViewById(R.id.TextView01);
        // 顯示
        tv.setText("組件包名稱："+packageName+"\n"+"組件類名稱："+className);
    }
}

/Chapter06_Intent_ComponentName/res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <Button 
        android:text="測試Intent的組件名稱屬性" 
        android:id="@+id/myButton01" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"></Button>
</LinearLayout>

/Chapter06_Intent_ComponentName/res/layout/my_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >

    <TextView 
        android:text="@+id/TextView01" 
        android:id="@+id/TextView01" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"></TextView>
    
</LinearLayout>