我希望在一个线程完成执行后运行一个线程。
这里我使用进度条，进度条完成后方法do1（）应该执行但是当我运行应用程序时应用程序强制关闭。
这是我的代码..
public void onenc(View view) {
progressBar = new ProgressDialog(view.getContext());
progressBar.setCancelable(true);
progressBar.setMessage("Ecoding Text ...");
progressBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressBar.setProgress(0);
progressBar.setMax(100);
progressBar.show();
//reset progress bar status
progressBarStatus = 0;
//reset filesize
fileSize = 0;
new Thread(new Runnable() {
public void run() {
while (progressBarStatus < 100) {
// process some tasks
progressBarStatus = doSomeTasks();
// your computer is too fast, sleep 1 second
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
// Update the progress bar
progressBarHandler.post(new Runnable() {
public void run() {
progressBar.setProgress(progressBarStatus);
}
});
}
// ok, file is downloaded,
if (progressBarStatus >= 100) {
// sleep 2 seconds, so that you can see the 100%
try {
Thread.sleep(2000);
} catch (Exception e) {
e.printStackTrace();
}
// close the progress bar dialog
progressBar.dismiss();
}
}
}).start();
Thread tt =new Thread(new Runnable() {
public void run() {
do1();
try {
Thread.sleep(1100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
});
tt.start();
}
我也尝试过AsyncTask，但两者同时运行。
请帮帮我，我是android的新手。
提前致谢。
更新
AsyncTask之后
class MyFirstTask extends AsyncTask<String, Boolean, Boolean> {
@Override
protected Boolean doInBackground(String... params) {
return null;
//Do Stuff
}
public void progressUpdate(Integer progress) {
new Thread(new Runnable() {
public void run() {
while (progressBarStatus < 100) {
// process some tasks
progressBarStatus = doSomeTasks();
// your computer is too fast, sleep 1 second
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
// Update the progress bar
progressBarHandler.post(new Runnable() {
public void run() {
progressBar.setProgress(progressBarStatus);
}
});
}
// ok, file is downloaded,
if (progressBarStatus >= 100) {
// sleep 2 seconds, so that you can see the 100%
try {
Thread.sleep(2000);
} catch (Exception e) {
e.printStackTrace();
}
// close the progress bar dialog
progressBar.dismiss();
}
}
}).start();
}
@Override
protected void onPostExecute(Boolean result) {
//Call your next task
Thread tt =new Thread(new Runnable() {
public void run() {
do1();
try {
Thread.sleep(1100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
});
tt.start();
}
}
现在甚至没有一个线程正在执行应用程序强制关闭
另一次更新后
class MyFirstTask extends AsyncTask<String, Boolean, Boolean> {
@Override
protected Boolean doInBackground(String... params) {
new Thread(new Runnable() {
public void run() {
while (progressBarStatus < 100) {
// process some tasks
progressBarStatus = doSomeTasks();
// your computer is too fast, sleep 1 second
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
// Update the progress bar
progressBarHandler.post(new Runnable() {
public void run() {
progressBar.setProgress(progressBarStatus);
}
});
}
// ok, file is downloaded,
if (progressBarStatus >= 100) {
// sleep 2 seconds, so that you can see the 100%
try {
Thread.sleep(2000);
} catch (Exception e) {
e.printStackTrace();
}
// close the progress bar dialog
progressBar.dismiss();
}
}
}).start();
return null;
//Do Stuff
}
public void progressUpdate(Integer progress) {
}
@Override
protected void onPostExecute(Boolean result) {
do1();
//Call your next task
/* Thread tt =new Thread(new Runnable() {
public void run() {
do1();
try {
Thread.sleep(1100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
});
tt.start();*/
}
}
现在函数do1（）在进度条完成之前执行。
终于解决了......这就是答案。 希望它能帮助别人
class MyFirstTask extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
progressBar.show();
}
@Override
protected String doInBackground(String... params) {
int i=0;
while(fileSize<100)
{
fileSize=fileSize+1;
publishProgress(""+(int)(fileSize));
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
publishProgress(""+(int)(fileSize));
return null;
}
public void onProgressUpdate(String... progress) {
progressBar.setProgress(Integer.parseInt(progress[0]));
}
@Override
protected void onPostExecute(String result) {
progressBar.dismiss();
do1();
}
}
答案 0 :(得分：1)
根本不使用Thread（）。使用AsyncTask，因为它使生活更轻松，并实现onPostExecute（）方法来调用下一个AsyncTask
class MyFirstTask extends AsyncTask<String, Boolean, Boolean> {
@Override
protected Boolean doInBackground(String... params) {
//Do Stuff that takes ages (background thread)
for(int i=0;i<100;i++){
doStuff();
Thread.sleep(1000L); //sleep because I'm just tired
publishProgress(i);
Thread.sleep(2000L); //sleep some more
}
}
@Override
public void progressUpdate(Integer progress) {
//Update progress bar (ui thread)
progressBar.setProgress(progress);
}
@Override
protected void onPostExecute(Boolean result) {
//Call your next task (ui thread)
new MyNextTask().execute();
}
开始你的第一个任务
new MyFirstTask().execute();
答案 1 :(得分：0)
您可以简单地使用join（）方法。
Thread first = new Thread();
Thread secThread =new Thread();
first.start();
first.join();
secThread.start();
但不要在主线程上执行此操作。