Android学习第六天---progreessbar

<LinearLayout 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:orientation="vertical"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/add"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="加" />

    <Button
        android:id="@+id/del"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="减" />

    <ProgressBar
        android:id="@+id/progressBar1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="我是进度值" />

    <ProgressBar
        android:id="@+id/progressBar2"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener{
    private ProgressBar progressBar2=null;
    private int num=0;
    private TextView textView=null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        ProgressBar progressBar1=(ProgressBar)findViewById(R.id.progressBar1);
        
        progressBar2=(ProgressBar)findViewById(R.id.progressBar2);
        
        progressBar2.incrementProgressBy(0);
        progressBar2.setSecondaryProgress(10);
        
        progressBar2.setVisibility(ProgressBar.VISIBLE);
        
        textView=(TextView)findViewById(R.id.textView1);
        
        Button add_button=(Button)findViewById(R.id.add);
        Button del_button=(Button)findViewById(R.id.del);
    
        add_button.setOnClickListener(this);
        del_button.setOnClickListener(this);
        
    }

    @Override
    public void onClick(View v) {
        
        switch (v.getId()) {
        case R.id.add:
            
            progressBar2.setProgress(++num);
            progressBar2.setSecondaryProgress(10+num);
            textView.setText(num+"%");
            break;
        case R.id.del:
            
            progressBar2.setProgress(--num);
            progressBar2.setSecondaryProgress(10+num);
            textView.setText(num+"%");
            break;
        }
    }


}