android开发之进度条
<ProgressBar
android:id="@+id/firstBar"
//设置进度条的样式为水平的
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="200dp"
android:layout_height="wrap_content"
//设置进度条为不可见
android:visibility="gone" />
2、圆形进度条
<ProgressBar
android:id="@+id/secondBar"
//设置进度条的样式为圆的
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone" />
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package com.example.progressbar;
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import android.app.Activity;
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import android.os.Bundle;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.widget.Button;
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import android.widget.ProgressBar;
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public class MainActivity extends Activity
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{
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private ProgressBar firstbar = null;
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private ProgressBar secondbar = null;
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private Button pbtn = null;
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private int i = 0;
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@Override
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protected void onCreate(Bundle savedInstanceState)
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{
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// TODO Auto-generated method stub
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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firstbar = (ProgressBar)findViewById(R.id.firstBar);
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secondbar = (ProgressBar)findViewById(R.id.secondBar);
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pbtn = (Button)findViewById(R.id.pbtn);
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pbtn.setOnClickListener(new OnClickListener()
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{
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@Override
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public void onClick(View v)
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{
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// TODO Auto-generated method stub
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if(i == 0)
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{
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firstbar.setVisibility(View.VISIBLE); //将第一个进度条设置为可见
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secondbar.setVisibility(View.VISIBLE);//将第二个进度条设置为可见
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}
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else if(i < 100)
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{
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//在第一个进度条里有两个进度
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firstbar.setProgress(i); //设置进度条走到哪里
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firstbar.setSecondaryProgress(i+10);//设置进度条走到哪里
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secondbar.setProgress(i);
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}
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else if(i>=100)
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{
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i=0;
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}
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else
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{
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firstbar.setVisibility(View.GONE);//将进度条设置为不可见
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secondbar.setVisibility(View.GONE);//将进度条设置为不可见
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}
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i=i+10;
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}
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});
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}
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- }
seekBar的使用方法:
1、在布局文件中声明SeekBar
<SeekBar
android:id="@+id/seekBar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
2、定义一个OnSeekBarChangeListener,也就是为SeekBar设置监听器
class SeekBarListener implements OnSeekBarChangeListener{
@Override
//当进度条发生改变的时候调用该函数,注意,这里的改变包括进度条自动变化,或者用手拖动进度条的滑块
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser)
{
// TODO Auto-generated method stub
}
@Override
//当用户开始拖动滑块时调用该函数
public void onStartTrackingTouch(SeekBar seekBar)
{
// TODO Auto-generated method stub
}
@Override
//当用户停止拖动滑块时调用该函数
public void onStopTrackingTouch(SeekBar seekBar)
{
// TODO Auto-generated method stub
}
}
源代码
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public class MainActivity extends Activity
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{
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private SeekBar seekBar = null;
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@Override
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protected void onCreate(Bundle savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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seekBar = (SeekBar)findViewById(R.id.seekBar);
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seekBar.setOnSeekBarChangeListener(new SeekBarListener());
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}
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class SeekBarListener implements OnSeekBarChangeListener{
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@Override
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public void onProgressChanged(SeekBar seekBar, int progress,
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boolean fromUser)
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{
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// TODO Auto-generated method stub
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//打印当前进度条的位置
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System.out.println(progress);
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}
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@Override
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public void onStartTrackingTouch(SeekBar seekBar)
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{
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// TODO Auto-generated method stub
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//当用户开始拖动滑块时,进度条的位置
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System.out.println("start-->" + seekBar.getProgress());
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}
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@Override
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public void onStopTrackingTouch(SeekBar seekBar)
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{
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// TODO Auto-generated method stub
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//当用户停止拖动滑块时,进度条的位置
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System.out.println("end-->" + seekBar.getProgress());
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}
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}
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@Override
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public boolean onCreateOptionsMenu(Menu menu)
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{
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// Inflate the menu; this adds items to the action bar if it is present.
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getMenuInflater().inflate(R.menu.main, menu);
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return true;
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}
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- }
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:paddingBottom="@dimen/activity_vertical_margin"
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android:paddingLeft="@dimen/activity_horizontal_margin"
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android:paddingRight="@dimen/activity_horizontal_margin"
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android:paddingTop="@dimen/activity_vertical_margin"
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tools:context=".MainActivity" >
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<TextView
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/hello_world" />
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<SeekBar
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android:id="@+id/seekBar"
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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/>
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- </RelativeLayout>
/*RatingBar的使用方法
* 1、在布局文件中声明一个RatingBar
* <RatingBar
android:id="@+id/ratingBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
//设置ratingBar的星的个数
android:numStars="5"
//设置每一次拖动走的大小为1个星
android:stepSize="1.0"
/>
2、定义一个OnRatingBarListener,为ratingBar设置监听器
class RatingBarListener implements RatingBar.OnRatingBarChangeListener{
@Override
//当用户拖动ratingBar时调用该函数
public void onRatingChanged(RatingBar ratingBar, float rating,
boolean fromUser)
{
// TODO Auto-generated method stub
}
}
*/
源代码
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public class MainActivity extends Activity
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{
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private RatingBar ratingBar = null;
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@Override
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protected void onCreate(Bundle savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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//找打ratingBar
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ratingBar = (RatingBar)findViewById(R.id.ratingBar);
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//绑定监听器
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ratingBar.setOnRatingBarChangeListener(new RatingBarListener());
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}
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class RatingBarListener implements RatingBar.OnRatingBarChangeListener{
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@Override
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//当用户拖动ratingBar时调用该函数
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public void onRatingChanged(RatingBar ratingBar, float rating,
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boolean fromUser)
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{
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// TODO Auto-generated method stub
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System.out.println("ratingBar" + rating);
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}
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}
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@Override
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public boolean onCreateOptionsMenu(Menu menu)
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{
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// Inflate the menu; this adds items to the action bar if it is present.
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getMenuInflater().inflate(R.menu.main, menu);
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return true;
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}
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- }
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:paddingBottom="@dimen/activity_vertical_margin"
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android:paddingLeft="@dimen/activity_horizontal_margin"
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android:paddingRight="@dimen/activity_horizontal_margin"
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android:paddingTop="@dimen/activity_vertical_margin"
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tools:context=".MainActivity" >
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<TextView
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/hello_world" />
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<RatingBar
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android:id="@+id/ratingBar"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:numStars="5"
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android:stepSize="1.0"
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/>
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- </RelativeLayout>
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