[TQC+ Android] 1-7 驗證 Activity Use Log

程式內有兩個Activity , 於Activity1按下按鈕"Go To Activity2" 時 , Activity 會被開啟 , 點選Activty2的Back to Activity1按鈕時 , 則會將Activity2關閉 , 同時回傳訊息 , 而題目希望透過Log來驗證Activity的生命週期 , 這題用意在測驗考生清不清楚 Activity Lifecycle , 如果清楚的話這題是相當簡單的 , 再配合Log顯示Activity的當前狀態即可 , 另外兩個Activity之間的資料往返 , 在記得要在AndroidManifest.xml 宣告另一支Activity , 以下是程式碼。

package COM.TQC.GDD01;

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

public class GDD01 extends Activity
{
  private static final String TAG = "Android_Log";
  private TextView tv;
  private Button b1;
  private Button b2;
  
  final int ACT1 = 1;
  private Intent intent;
  
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    tv=(TextView) findViewById(R.id.text1);;
    b1 = (Button) findViewById(R.id.button1);
    b2 = (Button) findViewById(R.id.button2);
    
    intent = new Intent();
    intent.setClass(this, GDD1_2.class);
    
    b1.setOnClickListener(new Button.OnClickListener()
    {
      public void onClick(View v)
      {
       startActivityForResult(intent,ACT1);
      }      
    });
    
    b2.setOnClickListener(new Button.OnClickListener()
    {
      public void onClick(View v)
      {
       finish();
      }
    });    
    Log.i(TAG, "onCreate()");    
  }
  
  @Override
  public void onActivityResult (int requestCode, int resultCode, Intent data)
  {
   tv.setText(""+resultCode);
  }  
  
  @Override
  public void onStart()
  {
    super.onStart();
    Log.i(TAG, "onStart()");
  }
  @Override
  public void onResume()
  {
    super.onResume();
    Log.i(TAG, "onResume()");
  }
  @Override
  public void onPause()
  {
    super.onPause();
    Log.i(TAG, "onPause()");
  }
  @Override
  public void onStop()
  {
    super.onStop();
    Log.i(TAG, "onStop()");
  }
  @Override
  public void onRestart()
  {
    super.onRestart();
    Log.i(TAG, "onRestart()");
  }
  @Override
  public void onDestroy()
  {
    super.onDestroy();
    Log.i(TAG, "onDestroy()");
  }
}

package COM.TQC.GDD01;

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


public class GDD1_2 extends Activity
{ 
 Button backButton;
 
 @Override
 public void onCreate(Bundle savedInstanceState)
 {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.mylayout);
     
     backButton = (Button) findViewById(R.id.button2);
     backButton.setOnClickListener(new Button.OnClickListener()
     {
       public void onClick(View v)
       {
        GDD1_2.this.setResult(99);
        finish();
       }
     });     
 }  
}

接下來是簡單的Layout

不要忘記AndroidManifest.xml 的宣告

P.S. 題目中所要求的Variable和Method皆會保留 , 也會根據題目所要求的流程去實作 , 縱使題目要求繞遠路....