自定义android Intent Action与继承TextView形成一个动态改变text的View

//Activity
package com.android.Somejavaknowledget;

import java.util.Date;

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

public class Somejavaknowledget extends Activity {
/** Called when the activity is first created. */
public static final String MyAction="Customized-Action-ChangeText";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/*requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);*/
//客制化Title
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);

setContentView(R.layout.main);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.custom_gallery_title);
TextView tv = (TextView)getWindow().findViewById(R.id.left_text);
tv.setText("hello");

DateView dv= (DateView)findViewById(R.id.tv);
dv.setUpdates(true);
Button btn = (Button) getWindow().findViewById(
R.id.close);
btn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
System.out.println("finish this activity");
finish();

}
});
Button show = (Button)findViewById(R.id.change);
show.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
//自定义的Action
Intent intent= new Intent();
intent.setAction(MyAction);
sendBroadcast(intent);

}
});

}
}

//DateView 继承TextView 通过reciver broadcast 动态改变text

package com.android.Somejavaknowledget;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.TextView;
import android.view.MotionEvent;

import java.text.DateFormat;
import java.util.Date;
import java.util.Formatter;

public final class DateView extends TextView {
private static final String TAG = "DateView";

private boolean mUpdating = false;
private Context mContext;
private static int count=1;

private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
/* if (action.equals(Intent.ACTION_TIME_TICK)
|| action.equals(Intent.ACTION_TIMEZONE_CHANGED)) {
updateClock();
}*/
if(action.equalsIgnoreCase(Somejavaknowledget.MyAction)){
updateClock();
}
}
};

public DateView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext=context;
}

@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
}

@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
setUpdates(false);
}

@Override
protected int getSuggestedMinimumWidth() {
// makes the large background bitmap not force us to full width
return 0;
}

private final void updateClock() {
//Date now = new Date();
//setText(DateFormat.getDateInstance(DateFormat.LONG).format(now));
String s=String.format("count=%d", count);
setText(s);
count++;
}

void setUpdates(boolean update) {
if (update != mUpdating) {
mUpdating = update;
if (update) {
// Register for Intent broadcasts for the clock and battery
IntentFilter filter = new IntentFilter();
/*filter.addAction(Intent.ACTION_TIME_TICK);
filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);*/
filter.addAction(Somejavaknowledget.MyAction);
mContext.registerReceiver(mIntentReceiver, filter, null, null);
updateClock();
} else {
mContext.unregisterReceiver(mIntentReceiver);
}
}
}
}

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