以下ProgressBar跟Handle结合，模拟进度条的使用，当进度条完成时会跳转到TestActivity
main.xml布局文件
<?
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
"
>
<!--
长方形进度条，一开始不可见，直到点击按钮时才出现进度条
-->
<
ProgressBar android:id
=
"
@+id/progressBar
"
style
=
"
?android:attr/progressBarStyleHorizontal
"
mce_style
=
"
?android:attr/progressBarStyleHorizontal
"
android:layout_width
=
"
fill_parent
"
android:layout_height
=
"
wrap_content
"
android:visibility
=
"
gone
"
android:max
=
"
100
"
/>
<!--
圆形进度条
-->
<!--<
ProgressBar android:id
=
"
@+id/progressBar
"
style
=
"
?android:attr/progressBarStyleLarge
"
mce_style
=
"
?android:attr/progressBarStyleLarge
"
android:layout_width
=
"
wrap_content
"
android:layout_height
=
"
wrap_content
"
/>-->
<
Button android:id
=
"
@+id/start
"
android:text
=
"
启动进度条
"
android:layout_width
=
"
wrap_content
"
android:layout_height
=
"
wrap_content
"
/>
<
Button android:id
=
"
@+id/stop
"
android:text
=
"
停止进度条
"
android:layout_width
=
"
wrap_content
"
android:layout_height
=
"
wrap_content
"
/>
</
LinearLayout
>
PbActivity类
package
com.ljq.pb;
import
android.app.Activity;
import
android.content.Intent;
import
android.os.Bundle;
import
android.os.Handler;
import
android.view.View;
import
android.widget.Button;
import
android.widget.ProgressBar;
public
class
PbActivity
extends
Activity {
private
ProgressBar progressBar
=
null
;
private
Button start
=
null
, stop
=
null
;
//
定义Handler对象
private
Handler handler
=
new
Handler();
@Override
public
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.main);
progressBar
=
(ProgressBar) findViewById(R.id.progressBar);
progressBar.setProgress(
0
);
start
=
(Button) findViewById(R.id.start);
start.setOnClickListener(
new
View.OnClickListener() {
public
void
onClick(View v) {
handler.post(runnable);
//
开始执行
}
});
stop
=
(Button)findViewById(R.id.stop);
stop.setOnClickListener(
new
View.OnClickListener() {
public
void
onClick(View v) {
handler.removeCallbacks(runnable);
//
停止执行
progressBar.setProgress(
0
);
}
});
}
int
pro
=
0
;
Runnable runnable
=
new
Runnable(){
public
void
run() {
progressBar.setVisibility(View.VISIBLE);
pro
=
progressBar.getProgress()
+
10
;
progressBar.setProgress(pro);
//
如果进度小于100,，则延迟1000毫秒后重复执行runnable
if
(pro
<
100
){
handler.postDelayed(runnable,
1000
);
}
else
{
progressBar.setVisibility(View.GONE);
startActivity(
new
Intent(PbActivity.
this
, TestActivity.
class
));
handler.removeCallbacks(runnable);
progressBar.setProgress(
0
);
}
}
};
}
运行结果
