android.view.ViewGroup

protected void onLayout(boolean changed, int l, int t, int r, int b)

执行layout操作时调用onLayout方法。View要给它的每个Child设定size和position。拥有Children的子类需要重写onLayout方法并且调用每个Child的layout方法。

参数changed表示view的size或position发生变化。参数l, t, r, b分别表示相对于parent的left, top, right, bottom position。

 

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)

测量View及其Content,确定measuredWidth和measuredHeight。在方法measure(int, int)中调用。重写onMeasure方法时,需要调用方法setMeasuredDimension(int, int),存储View的measuredWidth和measuredHeight。若存储失败,方法measure(int, int)会抛出异常IllegalStateException。可以调用super.onMeasure(int, int)方法。

除非MeasureSpec准许更大的size,否则measure的默认实现是background size。子类重写onMeasure(int, int)提供Content的更佳测量。如果onMeasure被重写,子类必须保证measuredWidth和measuredHeight至少是view的minHeight和minWidth。minHeight/Width通过getSuggestedMinimumHight/Width()获取。

参数width/heightMeasureSpec表示parent强加的horizontal/vertical space要求。

 

void android.view.ViewGroup.layout(int l, int t, int r, int b)

给view及其descendants设定size和position。它正是layout机制的第2个步,每个parent调用它的chlidren的layout操作。使用在measure阶段测量得到的size和position数据完成layout操作。拥有child的子类必须重写onLayout方法,调用每个child的layout操作。

 

void android.view.ViewGroup.measureChildren(int widthMeasureSpec, int heightMeasureSpec)

请View的所有children测量themseles, 测量依据是View的MeasureSpec和padding。忽略处于GONE状态的children,是否GONE状态由getChildMeasureSpec来确定。

参数width/heightMeasureSpec表示view的width/height要求。





使用自定义布局,页面布局中包含ScrollVIew,在软键盘弹起后,布局的高度会发生改变,根据布局的高度来判断软键盘的状态。

1.  package com.ransj.keyboard;
2.  
3.  import android.content.Context;
4.  import android.util.AttributeSet;
5.  import android.util.Log;
6.  import android.widget.RelativeLayout;
7.  
8.  public class KeyboardLayout extends RelativeLayout {
9.  private static final String TAG = KeyboardLayout.class.getSimpleName();
10.  public static final byte KEYBOARD_STATE_SHOW = -3;
11.  public static final byte KEYBOARD_STATE_HIDE = -2;
12.  public static final byte KEYBOARD_STATE_INIT = -1;
13.  private boolean mHasInit;
14.  private boolean mHasKeybord;
15.  private int mHeight;
16.  private onKybdsChangeListener mListener;
17.  
18.  public KeyboardLayout(Context context, AttributeSet attrs, int defStyle) {
19.  super(context, attrs, defStyle);
20.  }
21.  
22.  public KeyboardLayout(Context context, AttributeSet attrs) {
23.  super(context, attrs);
24.  }
25.  
26.  public KeyboardLayout(Context context) {
27.  super(context);
28.  }
29.  /**
30.  * set keyboard state listener
31.  */
32.  public void setOnkbdStateListener(onKybdsChangeListener listener){
33.  mListener = listener;
34.  }
35.  @Override
36.  protected void onLayout(boolean changed, int l, int t, int r, int b) {
37.  super.onLayout(changed, l, t, r, b);
38.  if (!mHasInit) {
39.  mHasInit = true;
40.  mHeight = b;
41.  if (mListener != null) {
42.  mListener.onKeyBoardStateChange(KEYBOARD_STATE_INIT);
43.  }
44.  } else {
45.  mHeight = mHeight < b ? b : mHeight;
46.  }
47.  if (mHasInit && mHeight > b) {
48.  mHasKeybord = true;
49.  if (mListener != null) {
50.  mListener.onKeyBoardStateChange(KEYBOARD_STATE_SHOW);
51.  }
52.  Log.w(TAG, "show keyboard.......");
53.  }
54.  if (mHasInit && mHasKeybord && mHeight == b) {
55.  mHasKeybord = false;
56.  if (mListener != null) {
57.  mListener.onKeyBoardStateChange(KEYBOARD_STATE_HIDE);
58.  }
59.  Log.w(TAG, "hide keyboard.......");
60.  }
61.  }
62.  
63.  public interface onKybdsChangeListener{
64.  public void onKeyBoardStateChange(int state);
65.  }
66.  }


复制代码

这个是自定义的布局,自定义布局可以继承各种常见布局。自定义布局有键盘状态改变监听器,可以通过注册监听器来监听软键盘状态。

1.  <?xml version="1.0" encoding="utf-8"?>
2.  <com.ransj.keyboard.KeyboardLayout xmlns:android="http://schemas.android.com/apk/res/android"
3.      android:id="@+id/keyboardLayout1"
4.      android:layout_width="fill_parent"
5.      android:layout_height="fill_parent" >
6.  
7.      <ScrollView
8.          android:layout_width="fill_parent"
9.          android:layout_height="fill_parent"
10.          android:layout_alignParentLeft="true"
11.          android:layout_alignParentTop="true"
12.          android:fillViewport="true" >
13.  
14.          <LinearLayout
15.              android:layout_width="fill_parent"
16.              android:layout_height="wrap_content"
17.              android:orientation="vertical" >
18.  
19.              <TextView
20.                  android:id="@+id/testone_tv"
21.                  android:layout_width="fill_parent"
22.                  android:layout_height="wrap_content"
23.                  android:background="#000000"
24.                  android:gravity="center"
25.                  android:text="软件盘弹起,我将消失!软键盘隐藏,我将回来!"
26.                  android:layout_weight="1.0"
27.                  android:textColor="#00ff00"
28.                  android:textStyle="bold" />
29.  
30.              <EditText
31.                  android:id="@+id/testone_et"
32.                  android:layout_width="fill_parent"
33.                  android:layout_height="wrap_content"></EditText>
34.          </LinearLayout>
35.      </ScrollView>
36.  
37.  </com.ransj.keyboard.KeyboardLayout>


复制代码

这个是优化页面的布局,从上面可以看出自定义布局的用法。

1.  package com.ransj.keyboard;
2.  
3.  import com.ransj.keyboard.KeyboardLayout.onKybdsChangeListener;
4.  
5.  import android.app.Activity;
6.  import android.os.Bundle;
7.  import android.view.View;
8.  import android.widget.TextView;
9.  import android.widget.Toast;
10.  /**
11.  * 
12.  *
13.  */
14.  public class TestOne extends Activity{
15.  
16.          @Override
17.          protected void onCreate(Bundle savedInstanceState) {
18.                  super.onCreate(savedInstanceState);
19.                  setContentView(R.layout.testone);
20.                  KeyboardLayout mainView = (KeyboardLayout) findViewById(R.id.keyboardLayout1);
21.                  final TextView tv = (TextView) findViewById(R.id.testone_tv);
22.                  mainView.setOnkbdStateListener(new onKybdsChangeListener() {
23.                          
24.                          public void onKeyBoardStateChange(int state) {
25.                                  switch (state) {
26.                                  case KeyboardLayout.KEYBOARD_STATE_HIDE:
27.                                          tv.setVisibility(View.VISIBLE);
28.                                          Toast.makeText(getApplicationContext(), "软键盘隐藏", Toast.LENGTH_SHORT).show();
29.                                          break;
30.                                  case KeyboardLayout.KEYBOARD_STATE_SHOW:
31.                                          tv.setVisibility(View.INVISIBLE);
32.                                          Toast.makeText(getApplicationContext(), "软键盘弹起", Toast.LENGTH_SHORT).show();
33.                                          break;
34.                                  }
35.                          }
36.                  });
37.          }
38.  
39.          @Override
40.          protected void onDestroy() {
41.                  super.onDestroy();
42.          }
43.  
44.          @Override
45.          protected void onPause() {
46.                  super.onPause();
47.          }
48.  
49.  }


复制代码

这个是优化页面的代码逻辑,通过注册监听器,来监听软键盘事件。在软键盘弹起时隐藏Textview,在软键盘隐藏时显示Textview。


msg_send_view.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

@Override
public void onGlobalLayout() {
int total_msg_height=msg_send_view.getRootView().getHeight()-msg_send_view.getHeight();
LogHelper.info("******************************2布局高度:"+currentHeight);//获取当前短信布局高度
LogHelper.info("******************************2屏幕高度:"+globleHeight);//获取当前短信布局高度
LogHelper.info("******************************2适配器高度:"+msgHeight);//获取当前短信布局高度
msgHeight=mPullRefreshListView.getMeasuredHeight();
if(total_msg_height>100){
if(currentHeight>msgHeight){

actualListView.setStackFromBottom(true);
}
else{
actualListView.setStackFromBottom(false);

}
}else{
if(currentHeight>globleHeight){
actualListView.setStackFromBottom(true);
}
else{
actualListView.setStackFromBottom(false);

}
}

}
});

}