12.8 SeekBar和RatingBar
o SeekBar的主要属性
o OnSeekBarChangeListener
fragment_main.xml
| <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 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" tools:context="com.pmplife.progressbar.MainActivity$PlaceholderFragment" >
<SeekBar android:id="@+id/firstSeekBar" android:layout_width="match_parent" android:layout_height="wrap_content"/>
RelativeLayout>
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MainActivity.java
| package com.pmplife.progressbar;
import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBar; import android.support.v4.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.SeekBar; import android.widget.SeekBar.OnSeekBarChangeListener; import android.os.Build;
public class MainActivity extends ActionBarActivity {
private SeekBar seekBar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fragment_main);
seekBar = (SeekBar)findViewById(R.id.firstSeekBar); seekBar.setMax(100); seekBar.setProgress(30); seekBar.setSecondaryProgress(50); SeekBarListener seekBarListener = new SeekBarListener(); seekBar.setOnSeekBarChangeListener(seekBarListener);
}
class SeekBarListener implements OnSeekBarChangeListener { @Override /* * seekBar 该对象指的是触发了监听器的SeekBar对象 * progress 指的是当前SeekBar的进度 * fromUser 进度变化是否由用户引起 * @see android.widget.SeekBar.OnSeekBarChangeListener#onProgressChanged(android.widget.SeekBar, int, boolean) */ public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { System.out.println("progress:"+progress+",fromUser"+fromUser);
}
@Override public void onStartTrackingTouch(SeekBar seekBar) { System.out.println("onStart");
}
@Override public void onStopTrackingTouch(SeekBar seekBar) { System.out.println("onStop");
} }
@Override public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; }
@Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); }
/** * A placeholder fragment containing a simple view. */ public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() { }
@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); return rootView; } }
}
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o RatingBar的主要属性
o OnRatingBarChangeListener
fragment_main.xml
| <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 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" tools:context="com.pmplife.progressbar.MainActivity$PlaceholderFragment" >
<SeekBar android:id="@+id/firstSeekBar" android:layout_width="match_parent" android:layout_height="wrap_content"/>
<RatingBar android:id="@+id/firstRatingBar" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/firstSeekBar" android:numStars="5" android:stepSize="0.5"/>
RelativeLayout>
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MainActivity.java
| package com.pmplife.progressbar;
import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBar; import android.support.v4.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.RatingBar; import android.widget.RatingBar.OnRatingBarChangeListener; import android.widget.SeekBar; import android.widget.SeekBar.OnSeekBarChangeListener; import android.os.Build;
public class MainActivity extends ActionBarActivity {
private SeekBar seekBar; private RatingBar ratingBar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fragment_main);
seekBar = (SeekBar)findViewById(R.id.firstSeekBar); seekBar.setMax(100); seekBar.setProgress(30); seekBar.setSecondaryProgress(50); SeekBarListener seekBarListener = new SeekBarListener(); seekBar.setOnSeekBarChangeListener(seekBarListener);
ratingBar=(RatingBar)findViewById(R.id.firstRatingBar); RatingBarListener ratingBarListener = new RatingBarListener(); ratingBar.setOnRatingBarChangeListener(ratingBarListener);
}
class RatingBarListener implements OnRatingBarChangeListener { @Override public void onRatingChanged(RatingBar ratingBar, float rating, boolean fromUser) { System.out.println("rating:"+rating+",fromUser"+fromUser);
} }
class SeekBarListener implements OnSeekBarChangeListener { @Override /* * seekBar 该对象指的是触发了监听器的SeekBar对象 * progress 指的是当前SeekBar的进度 * fromUser 进度变化是否由用户引起 * @see android.widget.SeekBar.OnSeekBarChangeListener#onProgressChanged(android.widget.SeekBar, int, boolean) */ public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { System.out.println("progress:"+progress+",fromUser"+fromUser);
}
@Override public void onStartTrackingTouch(SeekBar seekBar) { System.out.println("onStart");
}
@Override public void onStopTrackingTouch(SeekBar seekBar) { System.out.println("onStop");
} }
@Override public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; }
@Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); }
/** * A placeholder fragment containing a simple view. */ public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() { }
@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); return rootView; } }
}
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