Question

我正在按照Sams Teach Yourself Android Applications工作簿进行操作，并按照本书中的说明为QuizSplashActivity课程填写了以下内容。但是，我在粗体 * *的代码中出现错误，其中显示AnimationListener()：

package com.androidbook.triviaquiz;

import android.content.Intent;
import android.os.Bundle;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.view.animation.LayoutAnimationController;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

public class QuizSplashActivity extends QuizActivity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splash);

TextView logo1 = (TextView) findViewById(R.id.textViewTopTitle);
Animation fade1 = AnimationUtils.loadAnimation(this, R.anim.fade_in);
logo1.startAnimation(fade1);

TextView logo2 = (TextView) findViewById(R.id.textViewBottomTitle);
Animation fade3 = AnimationUtils.loadAnimation(this, R.anim.fade_in2);
logo2.startAnimation(fade3);

Animation spinin = AnimationUtils.loadAnimation(this, R.anim.custom_anim);
LayoutAnimationController controller = new LayoutAnimationController(spinin);
TableLayout table = (TableLayout) findViewById(R.id.tableLayout1);
for (int i = 0; i < table.getChildCount(); i++) {
    TableRow row = (TableRow) table.getChildAt(i);
    row.setLayoutAnimation(controller);

Animation fade2 = AnimationUtils.loadAnimation(this, R.anim.custom_anim);
fade2.setAnimationListener(new **AnimationListener()** {
    public void onAnimationEnd(Animation animation) {
        startActivity(new Intent(QuizSplashActivity.this, QuizMenuActivity.class));
        QuizSplashActivity.this.finish();
    }
});
}
}

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    // stop the animation
    TextView logo1 = (TextView) findViewById(R.id.textViewTopTitle);
    logo1.clearAnimation();

    TextView logo2 = (TextView) findViewById(R.id.textViewBottomTitle);
    logo2.clearAnimation();

    // ... stop other animations

    TableLayout table = (TableLayout) findViewById(R.id.tableLayout1);
    for (int i = 0; i < table.getChildCount(); i++) {
        TableRow row = (TableRow) table.getChildAt(i);
        row.clearAnimation();
    }
}

}

错误是：

＆＃34; The type new Animation.AnimationListener(){} must implement the inherited abstract method Animation.AnimationListener.onAnimationStart(Animation）＆＃34;

这本书没有提到任何关于这一点，只是想知道是否有人可以提供帮助。

提前致谢。

摩西

Answer 1

AnimationListener是一个界面。这意味着当您将其放入代码中时，您必须实现所有方法。如API所示，有三种方法：

onAnimationStart(Animation a)
onAnimationEnd(Animation a)
onAnimationRepeat(Animation a)

您只实施了一个：onAnimationEnd。你必须实施其他人，即使你什么也不做。

以下是您修改后的代码：

fade2.setAnimationListener(new AnimationListener() {
    public void onAnimationEnd(Animation animation) {
        startActivity(new Intent(QuizSplashActivity.this, QuizMenuActivity.class));
        QuizSplashActivity.this.finish();
    }
    public void onAnimationStart(Animation a) { }
    public void onAnimationRepeat(Animation a) { }

});

请注意班级中的新方法。

我希望这有帮助！

关于AnimationListener的活动类中的错误

1 个答案: