【并发编程】线程间通信的方式

管道流Pipes

“管道”是java.io包的一部分，它是Java的特性，而不是Android特有的。一条“管道”为两个线程建立一个单向的通道。生产者负责写数据，消费者负责读取数据。

public class PipeExampleActivity extends Activity {

    private static final String TAG = "PipeExampleActivity";
    private EditText editText;

    PipedReader r;
    PipedWriter w;

    private Thread workerThread;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        r = new PipedReader();
        w = new PipedWriter();

        try {
            w.connect(r);
        } catch (IOException e) {
            e.printStackTrace();
        }

        setContentView(R.layout.activity_pipe);
        editText = (EditText) findViewById(R.id.edit_text);
        editText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int start, int count, int after) {
            }

            @Override
            public void onTextChanged(CharSequence charSequence, int start, int before, int count) {
                try {
                    if(count > before) {
                        w.write(charSequence.subSequence(before, count).toString());
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void afterTextChanged(Editable editab