handler实例,progressbar
2011-10-13 02:14
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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"
>
<ProgressBar
android:id="@+id/bar"
android:layout_width="200dip"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal"
android:visibility="gone"
/>
<Button
android:id="@+id/startButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="start"
/>
</LinearLayout>
activity中的代码
package com.ph;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;
public class ProgressbarHandlerActivity extends Activity {
ProgressBar bar = null;
Button startButton = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
bar = (ProgressBar) findViewById(R.id.bar);
startButton = (Button) findViewById(R.id.startButton);
startButton.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
bar.setVisibility(View.VISIBLE);
updateBarHandler.post(updateThread);
}
});
}
//使用匿名内部类来复写handleMessage方法
Handler updateBarHandler = new Handler(){
@Override
public void handleMessage(Message msg) {//取消息
// TODO Auto-generated method stub
bar.setProgress(msg.arg1);
updateBarHandler.post(updateThread);
//super.handleMessage(msg);
}
};
//线程类,该类使用匿名内部类的方式进行声明
Runnable updateThread = new Runnable(){
int i = 0;
@Override
public void run() {
// TODO Auto-generated method stub
System.out.println("Sign Thread");
i = i + 10;
//得到一个消息对象
Message msg = updateBarHandler.obtainMessage();
//用arg1和arg2这两个成员变量传递消息,优点是系统性能消耗比较小
msg.arg1 = i;
try {
Thread.sleep(1000);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
updateBarHandler.sendMessage(msg);//发送消息
if( i == 100 ){
updateBarHandler.removeCallbacks(updateThread);
}
}
};
}
<?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"
>
<ProgressBar
android:id="@+id/bar"
android:layout_width="200dip"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal"
android:visibility="gone"
/>
<Button
android:id="@+id/startButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="start"
/>
</LinearLayout>
activity中的代码
package com.ph;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;
public class ProgressbarHandlerActivity extends Activity {
ProgressBar bar = null;
Button startButton = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
bar = (ProgressBar) findViewById(R.id.bar);
startButton = (Button) findViewById(R.id.startButton);
startButton.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
bar.setVisibility(View.VISIBLE);
updateBarHandler.post(updateThread);
}
});
}
//使用匿名内部类来复写handleMessage方法
Handler updateBarHandler = new Handler(){
@Override
public void handleMessage(Message msg) {//取消息
// TODO Auto-generated method stub
bar.setProgress(msg.arg1);
updateBarHandler.post(updateThread);
//super.handleMessage(msg);
}
};
//线程类,该类使用匿名内部类的方式进行声明
Runnable updateThread = new Runnable(){
int i = 0;
@Override
public void run() {
// TODO Auto-generated method stub
System.out.println("Sign Thread");
i = i + 10;
//得到一个消息对象
Message msg = updateBarHandler.obtainMessage();
//用arg1和arg2这两个成员变量传递消息,优点是系统性能消耗比较小
msg.arg1 = i;
try {
Thread.sleep(1000);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
updateBarHandler.sendMessage(msg);//发送消息
if( i == 100 ){
updateBarHandler.removeCallbacks(updateThread);
}
}
};
}
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