android之SeekBar控件用法详解

MainActivity.java

package com.example.mars_2400_seekbar;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.app.Activity;
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.widget.TextView;
import android.os.Build;

public class MainActivity extends Activity implements OnSeekBarChangeListener {
  private TextView tv;
  private SeekBar sb;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    tv = (TextView) findViewById(R.id.textView1);
    sb = (SeekBar) findViewById(R.id.seekbar);
    sb.setOnSeekBarChangeListener(this);
  }

  @Override
  public void onProgressChanged(SeekBar seekBar, int progress,
      boolean fromUser) {
    // TODO Auto-generated method stub
    tv.setText("Progress is " + progress
        + (fromUser ? " Trigger" : " Nontrigger") + " by user.");
  }


     @Override
      public void onStartTrackingTouch(SeekBar seekBar) {
          // TODO Auto-generated method stub
  	      System.out.println("onStart-->"+seekBar.getProgress());
      }

     @Override
      public void onStopTrackingTouch(SeekBar seekBar) {
          // TODO Auto-generated method stub
  	      System.out.println("onStop-->"+seekBar.getProgress());
      }


  @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;
  }

}

 activity_main.xml

 


 
 



 

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