我创建了一个简单的应用程序。
当用户触摸“开始..”按钮时，它会在按钮标签上显示“加载动画”。
我在我的 PC 上创建了应用程序(例如桌面应用程序)，并且运行良好。
Android的应用程序代码:
package com.example.threaddot;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;
public class MainActivity extends Activity {
SeekBar pointSpeed, numPoint;
Button startButton, detailsButton;
Thread count;
boolean started = false;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// my vars
startButton = (Button) findViewById(R.id.button_start);
detailsButton = (Button) findViewById(R.id.button_details);
numPoint = (SeekBar) findViewById(R.id.seekBar_numpoints);
pointSpeed = (SeekBar) findViewById(R.id.PointSpeedSeekBar);
count = new Thread(new Runnable() {
@Override
public void run() {
setDots();
}
});
startButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
count.start();
}
});
detailsButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
showAlert("Info",
String.format("Current: %s, %d points, and shown per %d m/s.", !started ? "working" : "suspend",
numPoint.getProgress(), pointSpeed.getProgress()));
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
public void setDots() {
int counter = 0, numPoints = numPoint.getProgress();
while(true) {
if(counter++ < 10) {
startButton.setText(startButton.getText() + ". ");
}
else {
counter = 0;
}
try {
Thread.sleep(200);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
void showAlert(String title, String msg) {
AlertDialog alertDialog;
alertDialog = new AlertDialog.Builder(this).create();
alertDialog.setTitle(title);
alertDialog.setMessage(msg);
alertDialog.show();
}
}
当我按下“开始 ..”按钮时，它崩溃了。
换句话说，
startButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
count.start();
}
});
应用程序崩溃。为什么？
日志:
01-18 20:07:43.453: W/dalvikvm(29186): threadid=10: thread exiting with uncaught exception (group=0x40018578)
01-18 20:07:43.500: E/AndroidRuntime(29186): FATAL EXCEPTION: Thread-11
01-18 20:07:43.500: E/AndroidRuntime(29186): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
01-18 20:07:43.500: E/AndroidRuntime(29186): at android.view.ViewRoot.checkThread(ViewRoot.java:3055)
01-18 20:07:43.500: E/AndroidRuntime(29186): at android.view.ViewRoot.invalidateChild(ViewRoot.java:649)
01-18 20:07:43.500: E/AndroidRuntime(29186): at android.view.ViewRoot.invalidateChildInParent(ViewRoot.java:675)
01-18 20:07:43.500: E/AndroidRuntime(29186): at android.view.ViewGroup.invalidateChild(ViewGroup.java:2511)
01-18 20:07:43.500: E/AndroidRuntime(29186): at android.view.View.invalidate(View.java:5279)
01-18 20:07:43.500: E/AndroidRuntime(29186): at android.widget.TextView.checkForRelayout(TextView.java:5782)
01-18 20:07:43.500: E/AndroidRuntime(29186): at android.widget.TextView.setText(TextView.java:2824)
01-18 20:07:43.500: E/AndroidRuntime(29186): at android.widget.TextView.setText(TextView.java:2685)
01-18 20:07:43.500: E/AndroidRuntime(29186): at android.widget.TextView.setText(TextView.java:2654)
01-18 20:07:43.500: E/AndroidRuntime(29186): at com.example.threaddot.MainActivity.setDots(MainActivity.java:66)
01-18 20:07:43.500: E/AndroidRuntime(29186): at com.example.threaddot.MainActivity$1.run(MainActivity.java:32)
01-18 20:07:43.500: E/AndroidRuntime(29186): at java.lang.Thread.run(Thread.java:1019)
01-18 20:10:49.632: W/ActivityThread(29426): Application com.example.threaddot is waiting for the debugger on port 8100...
01-18 20:10:49.648: I/System.out(29426): Sending WAIT chunk
01-18 20:10:49.859: I/System.out(29426): Debugger has connected
01-18 20:10:49.859: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:50.054: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:50.257: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:50.460: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:50.664: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:50.867: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:51.062: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:51.265: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:51.468: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:51.671: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:51.875: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:52.085: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:52.281: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:52.500: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:52.695: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:52.898: I/System.out(29426): waiting for debugger to settle...
01-18 20:10:53.101: I/System.out(29426): debugger has settled (1476)
01-18 20:12:48.117: W/dalvikvm(29426): threadid=10: thread exiting with uncaught exception (group=0x40018578)
01-18 20:12:48.195: E/AndroidRuntime(29426): FATAL EXCEPTION: Thread-10
01-18 20:12:48.195: E/AndroidRuntime(29426): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
01-18 20:12:48.195: E/AndroidRuntime(29426): at android.view.ViewRoot.checkThread(ViewRoot.java:3055)
01-18 20:12:48.195: E/AndroidRuntime(29426): at android.view.ViewRoot.invalidateChild(ViewRoot.java:649)
01-18 20:12:48.195: E/AndroidRuntime(29426): at android.view.ViewRoot.invalidateChildInParent(ViewRoot.java:675)
01-18 20:12:48.195: E/AndroidRuntime(29426): at android.view.ViewGroup.invalidateChild(ViewGroup.java:2511)
01-18 20:12:48.195: E/AndroidRuntime(29426): at android.view.View.invalidate(View.java:5279)
01-18 20:12:48.195: E/AndroidRuntime(29426): at android.widget.TextView.checkForRelayout(TextView.java:5782)
01-18 20:12:48.195: E/AndroidRuntime(29426): at android.widget.TextView.setText(TextView.java:2824)
01-18 20:12:48.195: E/AndroidRuntime(29426): at android.widget.TextView.setText(TextView.java:2685)
01-18 20:12:48.195: E/AndroidRuntime(29426): at android.widget.TextView.setText(TextView.java:2654)
01-18 20:12:48.195: E/AndroidRuntime(29426): at com.example.threaddot.MainActivity.setDots(MainActivity.java:66)
01-18 20:12:48.195: E/AndroidRuntime(29426): at com.example.threaddot.MainActivity$1.run(MainActivity.java:32)
01-18 20:12:48.195: E/AndroidRuntime(29426): at java.lang.Thread.run(Thread.java:1019)
01-18 20:14:52.031: D/AndroidRuntime(29761): Shutting down VM
01-18 20:14:52.031: W/dalvikvm(29761): threadid=1: thread exiting with uncaught exception (group=0x40018578)
01-18 20:14:52.062: E/AndroidRuntime(29761): FATAL EXCEPTION: main
01-18 20:14:52.062: E/AndroidRuntime(29761): java.lang.IllegalThreadStateException: Thread already started.
01-18 20:14:52.062: E/AndroidRuntime(29761): at java.lang.Thread.start(Thread.java:1227)
01-18 20:14:52.062: E/AndroidRuntime(29761): at com.example.threaddot.MainActivity$2.onClick(MainActivity.java:40)
01-18 20:14:52.062: E/AndroidRuntime(29761): at android.view.View.performClick(View.java:2485)
01-18 20:14:52.062: E/AndroidRuntime(29761): at android.view.View$PerformClick.run(View.java:9080)
01-18 20:14:52.062: E/AndroidRuntime(29761): at android.os.Handler.handleCallback(Handler.java:587)
01-18 20:14:52.062: E/AndroidRuntime(29761): at android.os.Handler.dispatchMessage(Handler.java:92)
01-18 20:14:52.062: E/AndroidRuntime(29761): at android.os.Looper.loop(Looper.java:130)
01-18 20:14:52.062: E/AndroidRuntime(29761): at android.app.ActivityThread.main(ActivityThread.java:3687)
01-18 20:14:52.062: E/AndroidRuntime(29761): at java.lang.reflect.Method.invokeNative(Native Method)
01-18 20:14:52.062: E/AndroidRuntime(29761): at java.lang.reflect.Method.invoke(Method.java:507)
01-18 20:14:52.062: E/AndroidRuntime(29761): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
01-18 20:14:52.062: E/AndroidRuntime(29761): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
01-18 20:14:52.062: E/AndroidRuntime(29761): at dalvik.system.NativeStart.main(Native Method)
01-18 20:15:35.492: W/ActivityThread(29953): Application com.example.threaddot is waiting for the debugger on port 8100...
01-18 20:15:35.734: I/System.out(29953): Sending WAIT chunk
01-18 20:15:35.937: I/System.out(29953): Debugger has connected
01-18 20:15:35.937: I/System.out(29953): waiting for debugger to settle...
01-18 20:15:36.140: I/System.out(29953): waiting for debugger to settle...
01-18 20:15:36.343: I/System.out(29953): waiting for debugger to settle...
01-18 20:15:36.546: I/System.out(29953): waiting for debugger to settle...
01-18 20:15:36.742: I/System.out(29953): waiting for debugger to settle...
01-18 20:15:36.945: I/System.out(29953): waiting for debugger to settle...
01-18 20:15:37.148: I/System.out(29953): waiting for debugger to settle...
01-18 20:15:37.359: I/System.out(29953): waiting for debugger to settle...
01-18 20:15:37.554: I/System.out(29953): waiting for debugger to settle...
01-18 20:15:37.757: I/System.out(29953): waiting for debugger to settle...
01-18 20:15:37.960: I/System.out(29953): waiting for debugger to settle...
01-18 20:15:38.164: I/System.out(29953): waiting for debugger to settle...
01-18 20:15:38.367: I/System.out(29953): debugger has settled (1495)
01-18 20:16:13.609: W/dalvikvm(29953): threadid=9: thread exiting with uncaught exception (group=0x40018578)
01-18 20:16:13.679: E/AndroidRuntime(29953): FATAL EXCEPTION: Thread-10
01-18 20:16:13.679: E/AndroidRuntime(29953): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
01-18 20:16:13.679: E/AndroidRuntime(29953): at android.view.ViewRoot.checkThread(ViewRoot.java:3055)
01-18 20:16:13.679: E/AndroidRuntime(29953): at android.view.ViewRoot.invalidateChild(ViewRoot.java:649)
01-18 20:16:13.679: E/AndroidRuntime(29953): at android.view.ViewRoot.invalidateChildInParent(ViewRoot.java:675)
01-18 20:16:13.679: E/AndroidRuntime(29953): at android.view.ViewGroup.invalidateChild(ViewGroup.java:2511)
01-18 20:16:13.679: E/AndroidRuntime(29953): at android.view.View.invalidate(View.java:5279)
01-18 20:16:13.679: E/AndroidRuntime(29953): at android.widget.TextView.checkForRelayout(TextView.java:5782)
01-18 20:16:13.679: E/AndroidRuntime(29953): at android.widget.TextView.setText(TextView.java:2824)
01-18 20:16:13.679: E/AndroidRuntime(29953): at android.widget.TextView.setText(TextView.java:2685)
01-18 20:16:13.679: E/AndroidRuntime(29953): at android.widget.TextView.setText(TextView.java:2654)
01-18 20:16:13.679: E/AndroidRuntime(29953): at com.example.threaddot.MainActivity.setDots(MainActivity.java:66)
01-18 20:16:13.679: E/AndroidRuntime(29953): at com.example.threaddot.MainActivity$1.run(MainActivity.java:32)
01-18 20:16:13.679: E/AndroidRuntime(29953): at java.lang.Thread.run(Thread.java:1019)
01-18 20:21:29.492: D/AndroidRuntime(30489): Shutting down VM
01-18 20:21:29.492: W/dalvikvm(30489): threadid=1: thread exiting with uncaught exception (group=0x40018578)
01-18 20:21:29.632: E/AndroidRuntime(30489): FATAL EXCEPTION: main
01-18 20:21:29.632: E/AndroidRuntime(30489): java.lang.IllegalThreadStateException: Thread already started.
01-18 20:21:29.632: E/AndroidRuntime(30489): at java.lang.Thread.start(Thread.java:1227)
01-18 20:21:29.632: E/AndroidRuntime(30489): at com.example.threaddot.MainActivity$2.onClick(MainActivity.java:40)
01-18 20:21:29.632: E/AndroidRuntime(30489): at android.view.View.performClick(View.java:2485)
01-18 20:21:29.632: E/AndroidRuntime(30489): at android.view.View$PerformClick.run(View.java:9080)
01-18 20:21:29.632: E/AndroidRuntime(30489): at android.os.Handler.handleCallback(Handler.java:587)
01-18 20:21:29.632: E/AndroidRuntime(30489): at android.os.Handler.dispatchMessage(Handler.java:92)
01-18 20:21:29.632: E/AndroidRuntime(30489): at android.os.Looper.loop(Looper.java:130)
01-18 20:21:29.632: E/AndroidRuntime(30489): at android.app.ActivityThread.main(ActivityThread.java:3687)
01-18 20:21:29.632: E/AndroidRuntime(30489): at java.lang.reflect.Method.invokeNative(Native Method)
01-18 20:21:29.632: E/AndroidRuntime(30489): at java.lang.reflect.Method.invoke(Method.java:507)
01-18 20:21:29.632: E/AndroidRuntime(30489): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
01-18 20:21:29.632: E/AndroidRuntime(30489): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
01-18 20:21:29.632: E/AndroidRuntime(30489): at dalvik.system.NativeStart.main(Native Method)
最佳答案
在日志中:
CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
意味着你需要runOnUiThread()用于更新以从 Thread 访问 Ui 元素:
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
// update textview here
}
});
将您的 setDots() 方法更改为:
public void setDots() {
int counter = 0, numPoints =0;
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
numPoints = numPoint.getProgress();
}
});
while(true) {
if(counter++ < 10) {
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
startButton.setText(startButton.getText() + ". ");
}
});
}
else {
counter = 0;
}
try {
Thread.sleep(200);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
关于Android - 线程正在破坏应用程序，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14405127/