08-24 07:33:48.061: E/AndroidRuntime(763): FATAL EXCEPTION: main
08-24 07:33:48.061: E/AndroidRuntime(763): java.lang.NullPointerException
08-24 07:33:48.061: E/AndroidRuntime(763): at android.view.ViewRoot.handleMessage(ViewRoot.java:1856)
08-24 07:33:48.061: E/AndroidRuntime(763): at android.os.Handler.dispatchMessage(Handler.java:99)
08-24 07:33:48.061: E/AndroidRuntime(763): at android.os.Looper.loop(Looper.java:130)
08-24 07:33:48.061: E/AndroidRuntime(763): at android.app.ActivityThread.main(ActivityThread.java:3683)
08-24 07:33:48.061: E/AndroidRuntime(763): at java.lang.reflect.Method.invokeNative(Native Method)
08-24 07:33:48.061: E/AndroidRuntime(763): at java.lang.reflect.Method.invoke(Method.java:507)
08-24 07:33:48.061: E/AndroidRuntime(763): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
08-24 07:33:48.061: E/AndroidRuntime(763): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
08-24 07:33:48.061: E/AndroidRuntime(763): at dalvik.system.NativeStart.main(Native Method)
线程exception
08-24 07:33:48.061: E/AndroidRuntime(763): java.lang.NullPointerException
08-24 07:33:48.061: E/AndroidRuntime(763): at android.view.ViewRoot.handleMessage(ViewRoot.java:1856)
08-24 07:33:48.061: E/AndroidRuntime(763): at android.os.Handler.dispatchMessage(Handler.java:99)
08-24 07:33:48.061: E/AndroidRuntime(763): at android.os.Looper.loop(Looper.java:130)
08-24 07:33:48.061: E/AndroidRuntime(763): at android.app.ActivityThread.main(ActivityThread.java:3683)
08-24 07:33:48.061: E/AndroidRuntime(763): at java.lang.reflect.Method.invokeNative(Native Method)
08-24 07:33:48.061: E/AndroidRuntime(763): at java.lang.reflect.Method.invoke(Method.java:507)
08-24 07:33:48.061: E/AndroidRuntime(763): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
08-24 07:33:48.061: E/AndroidRuntime(763): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
08-24 07:33:48.061: E/AndroidRuntime(763): at dalvik.system.NativeStart.main(Native Method)
线程exception
import java.text.SimpleDateFormat;
import java.util.Date;import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.TextView;public class TimeDemoActivity extends Activity {
TextView clockTime;
private Handler handler;
SimpleDateFormat formatter = new SimpleDateFormat(
"yyyy年MM月dd日 HH:mm:ss");
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
clockTime = (TextView) findViewById(R.id.clockTag);
handler = new Handler() { @Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
clockTime.setText((String)msg.obj);
/*当单个数据的时候可以mes0.obj方法,如果多个可以用下列Bundle方式....
Bundle bun = msg.getData();
String mesg_text = bun.getString("mesg_text");
clockTime.setText(mesg_text);*/
} }; new Thread() {
public void run() {
while(true){
init();
}
}
}.start(); } private void init() {
Date curDate = new Date(System.currentTimeMillis());// 获取当前时间 String text = formatter.format(curDate); Message mes0 = new Message();
mes0.obj = text;
handler.sendMessage(mes0);
/*当单个数据的时候可以mes0.obj方法,如果多个可以用下列Bundle方式....
Bundle bun0 = new Bundle();
bun0.putString("mesg_text", text);
mes0.setData(bun0);
handler.sendMessage(mes0);*/ step();
} private void step() {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}} LZ可以参考下~