Android常见控件— — —ProgressBar

ProgressBar用于在界面上显示一个进度条，表示我们的程序正在加载一些数据。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ProgressBar
        android:id="@+id/progress_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"/>

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="progress消失"/>

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="progress重现"/>

</LinearLayout>

package com.example.uiwidgettest2;

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

public class edittextActivity extends Activity{

    private ProgressBar progressBar = null;
    private Button btn1 = null;
    private Button btn2 = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.edittext);

        progressBar = (ProgressBar)findViewById(R.id.progress_bar);
        btn1 = (Button)findViewById(R.id.button1);
        btn2 = (Button)findViewById(R.id.button2);

        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(progressBar.getVisibility() == View.VISIBLE){
                    progressBar.setVisibility(View.GONE);
                }
            }
        });

        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(progressBar.getVisibility() == View.GONE){
                    progressBar.setVisibility(v.VISIBLE);
                }
            }
        });
    }

}

---

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ProgressBar
        android:id="@+id/progress_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        style="?android:attr/progressBarStyleHorizontal"
        android:max="100"
       />

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="progress"/>

</LinearLayout>

package com.example.uiwidgettest2;

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

public class edittextActivity extends Activity{

    private ProgressBar progressBar = null;
    private Button btn1 = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.edittext);

        progressBar = (ProgressBar)findViewById(R.id.progress_bar);
        btn1 = (Button)findViewById(R.id.button1);

        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int progress = progressBar.getProgress();
                progress = progress+10;
                if(progressBar.getProgress() <= 100){
                    progressBar.setProgress(progress);
                }
            }
        });

    }

}