package com.passion;import java.util.ArrayList;
import java.util.Random;import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Color;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.widget.AbsoluteLayout;
import android.widget.TextView;public class NewActivity extends Activity {
private MyCount mc;
private TextView tv;
private NewView view;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.i("line 29","1");
view = new NewView(null);
Log.i("line 31","2");
//设置背景
Resources res = getResources();
Drawable drawable = res.getDrawable(R.drawable.bac);
this.getWindow().setBackgroundDrawable(drawable);
//设置字体
Typeface typeface = Typeface.createFromAsset(getAssets(), "fonts/LithosPro-Bold.ttf");
tv = (TextView)findViewById(R.id.show);
tv.setTypeface(typeface);
tv.setTextColor(Color.BLACK);
//倒计时5s,每次间隔1s
mc = new MyCount(5000, 1000);
mc.start();
}
/*定义一个倒计时的内部类*/
class MyCount extends CountDownTimer {
public MyCount(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}
//倒计时结束之后做的事
@Override
public void onFinish() {
tv.setVisibility(View.INVISIBLE);
setContentView(view);
}
//倒计时的时候
@Override
public void onTick(long millisUntilFinished) {
tv.setText("请等待5秒(" + millisUntilFinished / 1000 + ")...");
}
}
}/*定义一个显示数字的类*/
class NewView extends AbsoluteLayout /*implements OnClickListener*/{
private int count = 5;
private TextView[] text = new TextView[count];
private int[] locationx = null;
private int[] locationy = null;
private int[] numbers = null;
private DisplayMetrics dm;
private int width;
private int height;
public NewView(Context context) {
super(context);
// TODO Auto-generated constructor stub
//获取屏幕的尺寸
dm = getResources().getDisplayMetrics();
width = dm.widthPixels;
height = dm.heightPixels;
//设置字体
Typeface typeface = Typeface.createFromAsset(context.getAssets(), "fonts/LithosPro-Bold.ttf");
numbers = randRange(count,10);
locationx = randRange(count,width-40);
locationy = randRange(count,height-40); for(int i =0;i<count;i++){
text[i] = new TextView(context);
addView(text[i],new AbsoluteLayout.LayoutParams(100,100, locationx[i], locationy[i]));
text[i].setText(numbers[i]+"");
text[i].setTextSize(40);
text[i].setTypeface(typeface);
text[i].setTextColor(Color.BLACK);
text[i].setId(numbers[i]);
}
}
//获得随机数组,num是产生随机数的个数,max是取值范围
public int[] randRange(int num ,int max) {
ArrayList<Integer> list = new ArrayList<Integer>();
Random rand = new Random();
while(true){
int rm = rand.nextInt(max);
if(!list.contains(rm)){
list.add(rm);
if(list.size()>=num)break;
}
}
int result[] = new int[num];
for(int i = 0;i<list.size();i++){
result[i] = list.get(i);
}
return result;
}
}运行的时候报错了:01-25 04:47:01.133: E/AndroidRuntime(472): Caused by: java.lang.NullPointerException
用log检查的时候只能运行到Log.i("line 29","1");所以我怀疑是自定义的view出了问题。前面countdowntimer的时候是用了在xml里面定义的main.xml,后面倒计时完了我想更改屏幕上的图片,用我自己定义的一个view。
求助各位大神,这个问题该怎么解决?顺祝大家新年快乐!!!!
解决方案 »
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为何传的是null,应该是this吧?你的构造是这样的:public NewView(Context context)