android *** Layout 05 button

写了一下button，大概用法 http://android-doc.com/guide/topics/ui/controls/button.html 里就讲的很清楚了，主要是在button的setOnClickListener里面有一些特别的

给activity implements一个OnClickListener接口，这个接口如下：

public interface OnClickListener {
/**
* Called when a view has been clicked.
*
* @param v The view that was clicked.
*/
void onClick(View v);
}

MainActivity.java

package com.example.tree;

import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnLongClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.GridView;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity implements OnClickListener{

private Button button1;
private Button button2;
private Button button3;
private ImageButton button4;
private Button button5;
private final String TAG="MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.i(TAG, "-onCreate-->>");
setContentView(R.layout.activity_main);
button1=(Button)this.findViewById(R.id.button1);
button2=(Button)this.findViewById(R.id.button2);
button3=(Button)this.findViewById(R.id.button3);
button4=(ImageButton)this.findViewById(R.id.imageButton1);//imagebutton
button5=(Button)this.findViewById(R.id.button4);

button1.setOnClickListener(this);
button2.setOnClickListener(this);
button3.setOnClickListener(this);
button4.setOnClickListener(this);
}

public void sendMessage(View v){//也可以用这种方法对button的按进行操作，其做法是在xml文件中的button下添加android:onClick="sendMess					//age"，然后再重写该方法
Toast.makeText(MainActivity.this, "button4", 1).show();;
}
public void onClick(View v){//重写OnClickListener接口中的onClick方法
switch(v.getId()){
case R.id.button1:Toast.makeText(MainActivity.this, "button1", 1).show();
case R.id.button2:Toast.makeText(MainActivity.this, "button2", 1).show();
case R.id.button3:Toast.makeText(MainActivity.this, "button3", 1).show();
case R.id.imageButton1:Toast.makeText(MainActivity.this, "imagebutton", 1).show();
}
}

protected void onStart(){
super.onStart();
Log.i(TAG, "-onStart-->>");
}

protected void onRestart(){
super.onRestart();
Log.i(TAG, "-onRestart-->>");
}

protected void onResume(){
super.onResume();
Log.i(TAG, "-onResume-->>");
}

protected void onPause(){
super.onPause();
Log.i(TAG, "-onPause-->>");
}

protected void onStop(){
super.onStop();
Log.i(TAG, "-onStop-->>");
}

protected void onDestroy(){
super.onDestroy();
Log.i(TAG, "-onDestroy-->>");
}

@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;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="@+id/relative"
tools:context="${relativePackage}.${activityClass}">

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="50dp"
android:layout_marginTop="48dp"
android:text="Button1"
/>

<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/button1"
android:layout_below="@+id/button1"
android:layout_marginTop="20dp"
android:text="Button2" />

<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button2"
android:layout_below="@+id/button2"
android:layout_marginTop="22dp"
android:text="Button3" />

<ImageButton
android:id="@+id/imageButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button3"
android:layout_below="@+id/button3"
android:layout_marginTop="30dp"
android:src="@drawable/s1" />

<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/button1"
android:layout_marginLeft="22dp"
android:layout_toRightOf="@+id/imageButton1"
android:text="Button4"
android:onClick="sendMessage" />

</RelativeLayout>