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apostila 20140414
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apostila 20140414
Transcript of apostila 20140414
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Threads em Android
Iremos construir outro exemplo bem simples utilizando thread.
Criar projeto no ADT: prjThread02
Crie uma classe chamada Processo
import android.util.Log;
import android.widget.Button;
public class Processo implements Runnable {
public Processo(MainActivity MainActivity){
this.MainActivity = MainActivity;
button = null;
rodando = true;
i = 0;
}
private int i;
private MainActivity MainActivity;
private Button button;
private static boolean rodando;
public synchronized static boolean getRodando() {
return rodando;
}
public synchronized static void setRodando(boolean _rodando) {
rodando = _rodando;
}
@Override
public void run() {
while (rodando) {
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try {
if (button == null) {
MainActivity.getHandler().post(new Runnable() {
@Override
public void run() {
button = MainActivity.getButton();
button.setText(Integer.toString(i));
button = null;
}
});
}
i++;
Thread.sleep(1000);
} catch (Exception e) {
Log.e("ERRO!!!", "Erro no mtodo RUN:\n" + e.getMessage());
}
}
}
}
Deixar o MainActivity.java da seguinte forma:
private Handler handler;
private Thread thread;
private Button button;
private RelativeLayout relativeLayout;
public synchronized Button getButton(){
return this.button;
}
public synchronized Handler getHandler(){
return this.handler;
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}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
button = new Button(this);
button.setText(Integer.toString(0));
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if (thread != null) {
Processo.setRodando(false);
}
}
});
relativeLayout = (RelativeLayout)findViewById(R.id.relativeLayout1);
relativeLayout.addView(button);
handler = new Handler();
thread = new Thread(new Processo(this));
thread.start();
} catch (Exception e) {
Log.e("ERRO!!!", "Erro no mtodo onCreate:\n" + e.getMessage());
}
}
@Override
protected void finalize() throws Throwable {
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Thread.sleep(5000);
super.finalize();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
button = new Button(this);
button.setText(Integer.toString(0));
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if (thread != null) {
Processo.setRodando(false);
}
}
});
relativeLayout = (RelativeLayout)findViewById(R.id.relativeLayout1);
relativeLayout.addView(button);
handler = new Handler();
thread = new Thread(new Processo(this));
thread.start();
} catch (Exception e) {
Log.e("ERRO!!!", "Erro no mtodo onCreate:\n" + e.getMessage());
}
}
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@Override
protected void finalize() throws Throwable {
Thread.sleep(5000);
super.finalize();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
Deixar o activity_main.xml conforme a seguir:
