为什么我的Android应用程序会继续在Android Studio模拟器中停止?

问题描述 投票:-2回答:1

我尝试修复所有问题,但似乎找不到问题。这是我的MainActivity.java文件:

package com.weebly.chesslearners.firstgame;

import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.app.Activity;
import android.renderscript.Sampler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;
import android.view.animation.TranslateAnimation;
import static android.content.ContentValues.TAG;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(new GamePanel(this));

    final TextView player = (TextView) findViewById(R.id.textView);
    final Button mover = (Button) findViewById(R.id.btnmove);

    final ObjectAnimator animation = ObjectAnimator.ofFloat(player,"y",300, 500);
    mover.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v){
            animation.setDuration(2000);
            animation.setRepeatCount(1);
            animation.setRepeatMode(ValueAnimator.REVERSE);
            animation.start();
        }
    });



    setContentView(R.layout.activity_main);
    Log.i(TAG, "Build Successful");

}

}

我也添加了所有导入。生成输出说错误在“ mover.setOnclick ...”行上,但是我找不到导致错误的原因。

java android nullpointerexception objectanimator
1个回答
0
投票

我认为问题出在setContentView(new GamePanel(this));行中

一旦设置了视图,编译器就会尝试在GamePanel()类中找到您的textViews和按钮,而我猜它不在那儿。

您可以通过添加setContentView(R.layout.activity_main);之前final TextView player = (TextView) findViewById(R.id.textView);

并稍后设置动态UI组件。

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