//8.圆形进度条
//8.1 获取
probar=(ProgressBar)findViewById(R.id.pbcircle);
//8.2线程
new Thread(new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
while(true){
circlepro=doWork();
Message m=new Message();
if(circlepro<100){
m.what =0x111;
circleh.sendMessage(m);
}
else{
m.what =0x110;
circleh.sendMessage(m);
break;
}
}
}
private int doWork(){
circlepro+=Math.random()*10;
try{
Thread.sleep(2000);
}
catch(InterruptedException e){
e.printStackTrace();
}
return circlepro;
}
}).start();
######logcat
11-19 21:43:50.931: W/dalvikvm(1260): threadid=14: thread exiting with uncaught exception (group=0xb4a2dba8)
11-19 21:43:50.931: E/AndroidRuntime(1260): FATAL EXCEPTION: Thread-96
11-19 21:43:50.931: E/AndroidRuntime(1260): Process: com.example.test1, PID: 1260
11-19 21:43:50.931: E/AndroidRuntime(1260): java.lang.NullPointerException
11-19 21:43:50.931: E/AndroidRuntime(1260): at com.example.test1.comActivity$3.run(comActivity.java:100)
11-19 21:43:50.931: E/AndroidRuntime(1260): at java.lang.Thread.run(Thread.java:841)
11-19 21:43:51.131: I/Choreographer(1260): Skipped 40 frames! The application may be doing too much work on its main thread.
eclipse Android
空指针异常：java.lang.NullPointerException
打印一下probar是不是空值
probar=(ProgressBar)findViewById(R.id.pbcircle);