android开发

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Java

EX06_02.java：源码内容
							package irdc.ex06_02;
/* import相关class */
import android.app.Activity;
import android.app.Dialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;
public class EX06_02 extends Activity
{
  /* 变量声明 */
  private int intLevel;
  private int intScale;
  private Button mButton01;
  /* 创建BroadcastReceiver */
  private BroadcastReceiver mBatInfoReceiver=new BroadcastReceiver()
  {
    public void onReceive(Context context, Intent intent)
    {
      String action = intent.getAction();
      /* 如果捕捉到的action是ACTION_BATTERY_CHANGED，
       * 就运行onBatteryInfoReceiver() */
      if (Intent.ACTION_BATTERY_CHANGED.equals(action))
      {
        intLevel = intent.getIntExtra("level", 0);
        intScale = intent.getIntExtra("scale", 100);
        onBatteryInfoReceiver(intLevel,intScale);
      }
    }
  };
  /** Called when the activity is first created. */
  @Override 
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    /* 载入main.xml Layout */
    setContentView(R.layout.main);
    /* 初始化Button，并设置点击后的动作 */
    mButton01 = (Button)findViewById(R.id.myButton1);
    mButton01.setOnClickListener(new Button.OnClickListener()
    {
      @Override
      public void onClick(View v)
      {
        /* 注册一个系统 BroadcastReceiver，作为访问电池计量之用 */
        registerReceiver
        (
          mBatInfoReceiver,
          new IntentFilter(Intent.ACTION_BATTERY_CHANGED)
        );
      }
    });
  }
  /* 捕捉到ACTION_BATTERY_CHANGED时要运行的method */
  public void onBatteryInfoReceiver(int intLevel, int intScale)
  {
    /* create 跳出的对话窗口 */
    final Dialog d = new Dialog(EX06_02.this);
    d.setTitle(R.string.str_dialog_title);
    d.setContentView(R.layout.mydialog);
    /* 创建一个背景模糊的Window，且将对话窗口放在前景 */
    Window window = d.getWindow();
    window.setFlags
    (
      WindowManager.LayoutParams.FLAG_BLUR_BEHIND,
      WindowManager.LayoutParams.FLAG_BLUR_BEHIND
    );
    /* 将取得的电池计量显示于Dialog中 */
    TextView mTextView02=(TextView)d.findViewById(R.id.myTextView2);
    mTextView02.setText 
    (
      getResources().getText(R.string.str_dialog_body)+ 
      String.valueOf(intLevel * 100 / intScale) + "%" 
    );
    /* 设置返回主画面的按钮 */
    Button mButton02 = (Button)d.findViewById(R.id.myButton2); 
    mButton02.setOnClickListener(new Button.OnClickListener()
    {
      @Override
      public void onClick(View v)
      {
        /* 反注册Receiver，并关闭对话窗口 */
        unregisterReceiver(mBatInfoReceiver);
        d.dismiss(); 
      }
    });
    d.show(); 
  }
}

						