MainActivity.java
package com.jing.example.nknu_.android_handler_progressdialog;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
private Button button;
private static ProgressDialog dialog;
private static Handler handler = new Handler(){
@Override
public void handleMessage(android.os.Message msg){
super.handleMessage(msg);
int index=msg.arg1;
dialog.setProgress(index);
if(msg.what==1){
dialog.dismiss();
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button)this.findViewById(R.id.button);
dialog = new ProgressDialog(this);
dialog.setTitle("提示");
dialog.setMessage("正在下載文件中...");
dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new Thread(new MyThread()).start();
dialog.show();
}
});
}
public class MyThread implements Runnable{
int count = 1;
int index = 1;
@Override
public void run(){
while(count<=100){
try{
Thread.sleep(100);
}catch(Exception e){
e.printStackTrace();
}
Message message = Message.obtain();
message.arg1=count;
handler.sendMessage(message);//發送到handleMessage處理
count ++ ;
}
//此處只有what，沒有count
Message end=Message.obtain();
end.what = 1;
handler.sendMessage(end);//發送到handleMessage處理
}
}
}
content_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.jing.example.nknu_.android_handler_progressdialog.MainActivity"
tools:showIn="@layout/activity_main">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="更新進度條UI"
android:id="@+id/button"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="172dp" />
</RelativeLayout>