如何在EclipseAndroid中调用整个类

我有一个navigationBtns.java类，它包含导航按钮及其onClick操作的代码。这就是它的全部功能，导航

package Mobile.Smart;

import android.app.Activity;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;

public class navigationBtns extends Activity {

    public static ImageButton vocabButton;
    public static ImageButton shapesButton;
    public static ImageButton mathButton;
    public static ImageButton mainNextButton;

    public static Intent vocabulary;
    public static Intent shapes;
    public static Intent math;
    public static Intent mainNext;


    /** Called when the activity is first created. */
    @Override  
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 
        /*Navigation buttons*/

        vocabButton = (ImageButton)findViewById(R.id.nextScreenWords);
        shapesButton = (ImageButton) findViewById(R.id.nextScreenShapes);
        mathButton = (ImageButton) findViewById(R.id.nextScreenMath);
        mainNextButton = (ImageButton) findViewById(R.id.goHome);

        vocabulary = new Intent(this,screen1.class);
        shapes = new Intent(this,screen2.class);
        math = new Intent(this,screen3.class);
        mainNext = new Intent(this,MobileSmartKidsActivity.class);

        vocabButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(vocabulary);
            }});

        shapesButton.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v){
                startActivity(shapes);
            }});

        mathButton.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) 
            {
                startActivity(math);
            }});          

        mainNextButton.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) 
            {
                startActivity(mainNext);
            }});

      }
}

在同一个软件包中，我有MobileSmartKidsActivity，它播放视频，然后具有navigationBtns.java中指定的相同导航按钮。还有3个其他文件使用相同的按钮。我已经重写了所有单独java文件中所有按钮的代码，这是过度冗余和内存消耗。如何在MobileSmartKidsActivity类中调用navigationBtns类？我以前在Java3D中做过，但我不知道如何在Android中做

包移动。智能

import android.app.Activity;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.MediaController;
import android.widget.VideoView;
import Mobile.Smart.navigationBtns;

public class MobileSmartKidsActivity extends Activity {

    private VideoView vd;
    private ImageButton vocabularyButton;
    private ImageButton shapesButton;
    private ImageButton mathButton;
    private ImageButton mainNextButton;

    private Intent vocabulary;
    private Intent shapes;
    private Intent math;

    /** Called when the activity is first created. */
    @Override  
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        setContentView(R.layout.main);        

        /*load and play video on home page*/        
        vd = (VideoView) findViewById(R.id.VideoView);
        Uri uri = Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.nursery);
        MediaController mc = new MediaController(this);
        vd.setMediaController(mc);
        vd.setVideoURI(uri);
        vd.start();

        vocabularyButton = (ImageButton)findViewById(R.id.nextScreenWords);
        shapesButton = (ImageButton) findViewById(R.id.nextScreenShapes);
        mathButton = (ImageButton) findViewById(R.id.nextScreenMath);
        mainNextButton = (ImageButton) findViewById(R.id.goHome);

        vocabulary = new Intent(this,screen1.class);
        shapes = new Intent(this,screen2.class);
        math = new Intent(this,screen3.class);

        vocabularyButton.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) 
            {
                startActivity(vocabulary);
            }});

        shapesButton.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) 
            {
                startActivity(shapes);
            }});

        mathButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) 
            {
                startActivity(math);
            }});          

        mainNextButton.setOnClickListener(new OnClickListener(){
                       @Override
            public void onClick(View v) 
            {}});                
      }
}

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您可以创建一个ButtonUtil类，该类具有一个静态方法，该方法将导航按钮作为参数并初始化它们。现在您只需要在两个onCreate方法中调用该方法。

您可以将按钮部分实现为一个，然后将其添加到所有需要的活动中。这样按钮的代码将只在一个地方

---

注意：片段需要API级别11或更高。

只需将nav按钮代码放入活动类中，就像您所拥有的那样，然后在创建所有其他活动时从该类而不是活动进行扩展。

我会尝试一下，但我在这方面还是个新手，所以我必须读一读。谢谢，我试过了。应用程序运行，但按钮没有响应。这就是navigationBtn类现在的样子：