Share object between threads WITH synchronized method
Share object between threads WITHOUT synchronized method
package com.example.androidthread;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.app.Activity;
public class MainActivity extends Activity {
Button buttonStart;
TextView textInfoA, textInfoB;
String infoMsgA;
String infoMsgB;
ShareClass shareObj = new ShareClass(10);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonStart = (Button) findViewById(R.id.buttonstart);
textInfoA = (TextView) findViewById(R.id.infoa);
textInfoB = (TextView) findViewById(R.id.infob);
buttonStart.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
infoMsgA = "Thread A\n";
infoMsgB = "Thread B\n";
textInfoA.setText(infoMsgA);
textInfoB.setText(infoMsgB);
new Thread(new Runnable() {
boolean stop = false;
@Override
public void run() {
while (!stop) {
if (shareObj.getCounter() > 0) {
infoMsgA += "A: "
+ shareObj.delayDecCounter(2500) + "\n";
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
textInfoA.setText(infoMsgA);
}
});
} else {
stop = true;
}
}
}
}).start();
new Thread(new Runnable() {
boolean stop = false;
@Override
public void run() {
while (!stop) {
if (shareObj.getCounter() > 0) {
infoMsgB += "B: "
+ shareObj.delayDecCounter(500) + "\n";
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
textInfoB.setText(infoMsgB);
}
});
} else {
stop = true;
}
}
}
}).start();
}
});
}
public class ShareClass {
int counter;
ShareClass(int c) {
counter = c;
}
public int getCounter() {
return counter;
}
public synchronized int delayDecCounter(int delay) {
int tmpCounter = counter;
try {
Thread.sleep(delay);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
tmpCounter--;
counter = tmpCounter;
return counter;
}
}
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://arteluzevida.blogspot.com/"
android:textStyle="bold" />
<Button
android:id="@+id/buttonstart"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="start()" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="with synchronized" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<TextView
android:id="@+id/infoa"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1" />
<TextView
android:id="@+id/infob"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
Next: Share object between threads with Synchronized Statements
- More example about Thread
