如何在 Android 中 10 秒后隐藏进度条？

Question

我正在处理Android。我想在与www.google.com 的连接成功后仅显示进度条 10 秒。这是我的代码。任何帮助表示赞赏。

MainActivity.java

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.ProgressBar;

public class MainActivity extends AppCompatActivity {
    Button button1;
    Public ProgressBar mProgress;
    progressCheck obj = new progressCheck(mProgress);
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        Button fab = (Button) findViewById(R.id.button1);
        mProgress =(ProgressBar) findViewById(R.id.progressBar);
        mProgress.setVisibility(View.GONE);

        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                    obj.execute();
            }
        });


    }

ProgressCheck.java 扩展 AsyncTask

   import android.os.AsyncTask;
import android.view.View;
import android.widget.ProgressBar;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

import java.io.IOException;

public class progressCheck  extends AsyncTask<String, String, String> {
    ProgressBar mProgressBar;

    public progressCheck(ProgressBar p){
        this.mProgressBar = p;
    }


    @Override
    protected String doInBackground(String... params) {

        Document doc = null;
        String url = "https://www.google.com.pk/";
        try {
            doc = Jsoup.connect(url).timeout(20 * 1000).get();
            Thread.sleep(10000);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        return null;
    }

    @Override
    protected void onPostExecute(String result) {
        mProgressBar.setVisibility(View.GONE);

    }


    @Override
    protected void onPreExecute() {
        mProgressBar.setVisibility(View.VISIBLE);
    }

    @Override
    protected void onProgressUpdate(String... text) {


    }

}

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.example.namal.circularprogressbar2.MainActivity"
    tools:showIn="@layout/activity_main">

    <ProgressBar
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/progressBar"
        android:layout_marginTop="36dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:indeterminate="false" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Start"
        android:id="@+id/button1"
        android:layout_below="@+id/progressBar"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="72dp" />


</RelativeLayout>

Answer 1

在 onPreExecute() 中将 Visibility 设置为 Visible，在 onPostExecute() 中将 Visibility 设置为 Gone

@Override
protected void onPostExecute(String result) {
     mProgress.setVisibility(View.GONE);
}

@Override
protected void onPreExecute() {
    mProgress.setVisibility(View.VISIBLE);
}

编辑：在AsyncTask 中定义进度条。

ProgressBar mProgress;

为您的 Asynctask 创建构造函数并将进度条引用传递给它。

public progressCheck(ProgressBar progressbar){
   this.mProgress = progressbar;

}

在你的活动中调用它progressCheck obj = new progressCheck(mProgress);

EDIT2：MainActivity

public class MainActivity extends AppCompatActivity {
Button button1;
Public ProgressBar mProgress;
progressCheck obj;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    Button fab = (Button) findViewById(R.id.button1);
    mProgress =(ProgressBar) findViewById(R.id.progressBar);
    obj = new progressCheck(mProgress);
    mProgress.setVisibility(View.GONE);

    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
                obj.execute();
        }
    });


}

Answer 2

new AsyncTask<Void, Void, Void>
{
    ProgressDialog pd = new ProgressDialog(MainActivity.this);
    @Override
    protected void onPreExecute() {
        super.onPreExecute();

        pd.setTitle("Please wait");
        pd.setMessage("Connecting to Google...");
        pd.setCancelable(false);
        pd.show();
    }


    @Override
    protected Void doInBackground(Void... params) {
        try{
           Thread.sleep(YOUR_TIME);
        } 
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }

    @Override
    protected void onPostExecute(Void aVoid) 
    {
        super.onPostExecute(aVoid);
        if (pd!=null && pd.isShowing())
        {
            pd.dismiss();
        }
    }
}.execute();

现在根据您的要求进行管理.. 希望这会有所帮助..

Answer 3

你要做的是在你的 AsyncTask onPostExecute 中写下这段代码。

Runnable runnable = new Runnable() {
    public void run () {
        // Do your stuff here  -- show your progress bar 
    }
}
Handler handler = new Handler();
handler.postDelayed(runnable, 10000);

完整代码

import android.os.AsyncTask;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

import java.io.IOException;

public class progressCheck  extends AsyncTask<String, String, String> {

    @Override
    protected String doInBackground(String... params) {

        Document doc = null;
        String url = "https://www.google.com.pk/";
        try {
            doc = Jsoup.connect(url).timeout(20 * 1000).get();
            Thread.sleep(10000);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        return null;
    }

    @Override
    protected void onPostExecute(String result) {
    Runnable runnable = new Runnable() {
    public void run () {
        // Do your stuff here  -- show your progress bar 
    }
}
Handler handler = new Handler();
handler.postDelayed(runnable, 10000);
    }


    @Override
    protected void onPreExecute() {

    }

    @Override
    protected void onProgressUpdate(String... text) {


   }
}

Answer 4

从 onClick() 方法中删除 mProgress 行。

fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                    obj.execute(); 
            }
        });

并在 onPreExecute() 方法中添加这些 mProgress 可见性行，在 onPostExecute() 方法中添加 mProgress Gone。

@Override
protected void onPostExecute(String result) {
   mProgress.setVisibility(View.GONE);
}


@Override
protected void onPreExecute() {
   mProgress.setVisibility(View.VISIBLE);
}

编辑

将 mProgress 传递给 progressCheck 类。

progressCheck obj = new progressCheck(mProgress);

并在进行中检查构造函数。

ProgressBar progress;
public progressCheck(ProgressBar mProgress){
   progress = mProgress;
}

而异步覆盖的方法就像......

@Override
protected void onPostExecute(String result) {
     progress.setVisibility(View.GONE);
}

@Override
protected void onPreExecute() {
    progress.setVisibility(View.VISIBLE);
}