1.ProgressDialog介绍
ProgressDialog可以在当前界面弹出一个置顶于所有界面元素的对话框，同样具有屏蔽其他控件的交互能力，用于提示用户当前操作正在运行，让用户等待；
2.应用案例
(1)页面布局的xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
tools:context=".AdvanceToolActivity"> <TextView
style="@style/TitleStyle"
android:text="高级工具" /> <TextView
android:id="@+id/tvAT_query_address"
android:text="归属地查询"
android:gravity="center"
android:textSize="18dp"
android:background="@drawable/selector_advanvetool_item_bg"
android:drawableLeft="@android:drawable/btn_star"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp"/> <TextView
android:id="@+id/tvAT_sms_copy"
android:text="短信备份"
android:gravity="center"
android:textSize="18dp"
android:background="@drawable/selector_advanvetool_item_bg"
android:drawableLeft="@android:drawable/btn_star"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp"/> </LinearLayout>
(2)java后台代码
package com.example.administrator.test62360safeguard; import android.annotation.SuppressLint;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView; public class AdvanceToolActivity extends AppCompatActivity {
TextView tvAT_query_address;
TextView tvAT_sms_copy;
private final static int MAXVALUE = 100;
private int currentProgress = 0;
private ProgressDialog progressDialog; //更新UI界面
@SuppressLint("HandlerLeak")
Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
progressDialog.setProgress(currentProgress);
if(currentProgress>=MAXVALUE){
progressDialog.dismiss();//关闭进度条对话框
}
}
}; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_advance_tool); //电话归属地查询
initPhoneAddress();
//短信备份
initSmsCopy();
} /**
* 短信备份
*/
private void initSmsCopy() {
tvAT_sms_copy=findViewById(R.id.tvAT_sms_copy);
tvAT_sms_copy.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showSmsCopyDialog();
}
});
} /**
* 显示一个带进度条的对话框
*/
private void showSmsCopyDialog() {
progressDialog = new ProgressDialog(this); //注意：这里的上下文必须是this，而不能用getApplicationContext()
progressDialog.setIcon(R.mipmap.ic_launcher); //设置对话框的图标
progressDialog.setTitle("短信备份"); //设置对话框标题
progressDialog.setMax(MAXVALUE); //设置进度条的最大值
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); //指定进度条的样式为水平
progressDialog.show(); //开启一个线程
new Thread(){
@Override
public void run() {
while (currentProgress<MAXVALUE){
currentProgress=currentProgress+5;
try {
Thread.sleep(500); //模拟耗时操作
} catch (InterruptedException e) {
e.printStackTrace();
}
handler.sendEmptyMessage(0);
}
}
}.start();
} /**
* 电话归属地查询
*/
private void initPhoneAddress() {
tvAT_query_address=findViewById(R.id.tvAT_query_address);
tvAT_query_address.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(getApplicationContext(),QueryAddressActivity.class);
startActivity(intent);
}
});
}
}
3.效果图