android各种返回写法

Button.setOnClickListener(mGoBack);public OnClickListener mGoBack = new OnClickListener() {    public void onClick(View v) {        finish();    }};

要返回上一个activity，只需结束当前的activity

有两Activity~A和BA运行启动BActivity保留A情形B结束时候传回参数A~~~
我用startActivity发现创建了新Activity~~~
能保留A现场啊
A启动B时样写

Intent intent=new Intent(MainActivity.this,SecMainActivity.class); startActivityForResult(intent, 1);@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {  // TODO Auto-generated method stub ...

在android中重写父类的onkeydown方法，就可以更方便的操作了。
Android代码收藏代码
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if(keyCode==KeyEvent.KEYCODE_BACK&&event.getRepeatCount()==0){
//需要处理
}
return false;
}
长按事件
Java代码收藏代码
@Override
public boolean onKeyLongPress(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_CALL) {
// a long press of the call key.
// do our work, returning true to consume it. by
// returning true, the framework knows an action has
// been performed on the long press, so will set the
// canceled flag for the following up event.
return true;
}
return super.onKeyLongPress(keyCode, event);
}

Java代码收藏代码
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_CALL && event.isTracking()
&& !event.isCanceled()) {
// if the call key is being released, AND we are tracking
// it from an initial key down, AND it is not canceled,
// then handle it.
return true;
}
return super.onKeyUp(keyCode, event);
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_0) {
// this tells the framework to start tracking for
// a long press and eventual key up. it will only
// do so if this is the first down (not a repeat).
event.startTracking();
return true;
}
return super.onKeyDown(keyCode, event);
}

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
if (event.getAction() == KeyEvent.ACTION_DOWN
&& event.getRepeatCount() == 0) {

// Tell the framework to start tracking this event.
getKeyDispatcherState().startTracking(event, this);
return true;

} else if (event.getAction() == KeyEvent.ACTION_UP) {
getKeyDispatcherState().handleUpEvent(event);
if (event.isTracking() && !event.isCanceled()) {

// DO BACK ACTION HERE
return true;

}
}
return super.dispatchKeyEvent(event);
} else {
return super.dispatchKeyEvent(event);
}
}

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