先獻上截圖
這個在程序中比較常見,常用於後臺程序運行提示用戶等待,並獲得屏幕焦點,而在後臺程序結束後則失去焦點
以下是一個簡單範例,其中xml中僅僅是一個Button和一個TextView,這裏不再詳述
package com.progressdialog;
import android.app.ProgressDialog;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
private Button btn_pro;
private TextView textView;
private ProgressDialog dialog = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_pro = (Button)super.findViewById(R.id.btn_pro);
textView = (TextView)super.findViewById(R.id.text);
btn_pro.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final CharSequence title = getString(R.string.title);
final CharSequence string = getString(R.string.string);
dialog = ProgressDialog.show(MainActivity.this,title,string,true);//獲得progressDialog對象
new Thread(){
@Override
public void run() {
try {
//這裏添加後臺程序
sleep(3000);//在休眠三秒後則失去焦點
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
dialog.dismiss();
}
}
}.start();
}
});
}
}