Android的事件处理

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center_horizontal">

    <EditText
        android:id="@+id/address"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="请填写收信号码"
        />
    <EditText
        android:id="@+id/content"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="请填写短信内容"
        android:lines="3"
        />
    <com.example.penghuster.myfirstapp.MyButton
        android:id="@+id/send"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="发送" />

</LinearLayout>

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;


public class MainActivity extends Activity {
    EditText address;
    EditText content;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        address = (EditText) findViewById(R.id.address);
        content = (EditText) findViewById(R.id.content);
        MyButton btn = (MyButton) findViewById(R.id.send);
        btn.requestFocus();
        btn.setFocusableInTouchMode(true);

        btn.setOnKeyListener(new View.OnKeyListener() {
            public boolean onKey(View source, int value, KeyEvent event) {
                if (event.getAction() == KeyEvent.ACTION_DOWN) {
                    Log.v("--Listener--", "the keydown ");
                }
                return false;
            }
        });

    }

    public boolean onKeyDown(int keyCode, KeyEvent event){
        super.onKeyDown(keyCode, event);
        Log.v("--activity---", "ddd");
        return false;
    }
}

class MyButton extends Button{
    public MyButton(Context context, AttributeSet set){
        super(context, set);
    }

    public boolean onKeyDown(int keyCode, KeyEvent event){
        super.onKeyDown(keyCode, event);
        Log.v("MyButton", "the onKeyDown in MyButton");
        return  false;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.penghuster.myfirstapp" >

    <uses-sdk
        android:maxSdkVersion="12"
        android:minSdkVersion="10" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:configChanges="orientation|screenSize"
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

import android.app.Activity;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.os.Bundle;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


public class MainActivity extends Activity {
    EditText address;
    EditText content;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        address = (EditText) findViewById(R.id.address);
        content = (EditText) findViewById(R.id.content);
        MyButton btn = (MyButton) findViewById(R.id.send);

        btn.setOnClickListener(new View.OnClickListener() {
            public void onClick(View source) {
                Configuration cfg = getResources().getConfiguration();

                if (cfg.orientation == Configuration.ORIENTATION_LANDSCAPE)
                    MainActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

                if (cfg.orientation == Configuration.ORIENTATION_PORTRAIT)
                    MainActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

            }
        });

    }


    public void onConfigurationChanged(Configuration configuration) {
        super.onConfigurationChanged(configuration);
        String screen = configuration.orientation == Configuration.ORIENTATION_LANDSCAPE ?
                "横向屏幕" : "竖向屏幕";
        Toast.makeText(this, "系统屏幕方向改变
" + "修改后屏幕方向为：" + screen, Toast.LENGTH_LONG).show();
    }
}

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;


public class MainActivity extends Activity {
    EditText address;
    EditText content;
    static final String UPPER_NUM = "upper";
    CalThread calThread;

    class CalThread extends Thread {
        public Handler mHandler;
        public void run(){
            Looper.prepare();
            mHandler = new Handler(){
                public void handleMessage(Message msg){
                    if (msg.what == 0x123){
                        int upper = msg.getData().getInt(UPPER_NUM);
                        List<Integer> nums = new ArrayList<Integer>();
                        outer:
                        for (int i=2; i<=upper; i++){
                            for (int j=2; j<=Math.sqrt(i); j++)
                                if (i != 2 && i % j ==0)
                                    continue outer;
                            nums.add(i);
                        }

                        Toast.makeText(MainActivity.this, nums.toString(), Toast.LENGTH_LONG).show();
                    }
                }
            };
            Looper.loop();
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        address = (EditText) findViewById(R.id.address);
        content = (EditText) findViewById(R.id.content);
        MyButton btn = (MyButton) findViewById(R.id.send);

        calThread = new CalThread();
        calThread.start();

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Message msg = new Message();
                msg.what = 0x123;
                Bundle bundle = new Bundle();
                bundle.putInt(UPPER_NUM, Integer.parseInt(address.getText().toString()));
                msg.setData(bundle);
                calThread.mHandler.sendMessage(msg);
            }
        });

    }

}

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;


public class MainActivity extends Activity {
    TextView address;
    TextView content;

    class DownTask extends AsyncTask<URL, Integer, String> {
        ProgressDialog pDialog;
        int hasRead = 0;
        Context mContext;

        public DownTask(Context ctx) {
            mContext = ctx;
        }

        protected String doInBackground(URL... params) {
            StringBuilder sb = new StringBuilder();
            try {
                URLConnection conn = params[0].openConnection();
                BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(),
                        "utf-8"));
                String line = null;
                while ((line = br.readLine()) != null) {
                    sb.append(line + "
");
                    hasRead++;
                    publishProgress(hasRead);
                }

                return sb.toString();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
            return null;
        }

        protected void onPostExecute(String result) {
            address.setText(result);
            pDialog.dismiss();
        }

        protected void onPreExecute() {
            pDialog = new ProgressDialog(mContext);
            pDialog.setTitle("任务执行中");
            pDialog.setMessage("任务执行中，敬请期待");
            pDialog.setCancelable(false);
            pDialog.setMax(202);
            pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            pDialog.setIndeterminate(true);
            pDialog.show();
        }

        protected void onProgressUpdate(Integer... values) {
            content.setText("已经读取了" + values[0] + "行！");
            pDialog.setProgress(values[0]);
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        address = (TextView) findViewById(R.id.address);
        content = (TextView) findViewById(R.id.content);
        MyButton btn = (MyButton) findViewById(R.id.send);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    DownTask task = new DownTask(MainActivity.this);
                    task.execute(new URL("http://www.cnblogs.com/renqingping/archive/2012/10/25/Parcelable.html"));
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
        });

    }

}