Android ProgressDialog

1）效果图如下

2）关键代码如下

package com.example.androidtestapp;


import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.*;
import android.view.View;
import android.app.ProgressDialog;


public class MainActivity extends Activity {


private Button button1=null;
private ProgressDialog progressDialog1=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1=(Button)findViewById(R.id.button1);
button1.setOnClickListener(new Button.OnClickListener(){
public void onClick(View view){
progressDialog1=ProgressDialog.show(MainActivity.this, "loading...", "please wait...",true);
//为看到明显的效果，创建线程以暂停3s.
new Thread(){
public void run(){
try{sleep(3000);}
catch(Exception e){e.printStackTrace();}
finally{progressDialog1.dismiss();}
}
}.start();
}
});
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}


}

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