动态添加视图android

1. android动态添加自定义TextView后如何更新某一个TextView的内容

public class MainActivity extends Activity { private int index; private TextView mTextView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mTextView = new TextView(this); setContentView(mTextView); new DataThread().start(); } private String getWebData() { return String.valueOf(++index); } private Handler mHandler = new Handler() { public void handleMessage(android.os.Message msg) { mTextView.setText((String)msg.obj); }; }; private class DataThread extends Thread { @Override public void run() { for(int i = 0; i < 4; i++) { try { Thread.sleep(1000); } catch (InterruptedException e) { } final String data = getWebData(); // 只能在主线程中修改ui控件 mHandler.sendMessage(mHandler.obtainMessage(0, data)); } } } }

2. android 如何动态布局自定义view,不用XML.

可以直接new View来得到View对象来实现代码布局。以下为示例代码：
1.绝对布局
AbsoluteLayout abslayout=new AbsoluteLayout (this);
setContentView(abslayout);
Button btn1 = new Button(this);
btn1.setText(”this is a button”);
btn1.setId(1);
AbsoluteLayout.LayoutParams lp1 =
new AbsoluteLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT,
0,100);
abslayout.addView(btn1, lp1);

2.相对布局
RelativeLayout relativeLayout = new RelativeLayout(this);
setContentView(relativeLayout);
AbsoluteLayout abslayout=new AbsoluteLayout (this);
RelativeLayout.LayoutParams lp1 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
lp1.addRule(RelativeLayout.ALIGN_PARENT_TOP);
lp1.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE);
relativeLayout.addView(abslayout ,lp1);

3.线性布局
LinearLayout ll = new LinearLayout(this);
EditText et = new EditText();
ll.addView(et);
//动态添加布局的方法1. LinearLayout ll = (LinearLayout)this.getLayoutInflater().inflate(R.layout.main1,null); setContentView(ll); LinearLayout ll2 = (LinearLayout)this.getLayoutInflater().inflate(R.layout.main2,ll); //这样 main2 作为 main1的子布局 加到了 main1的 根节点下
//动态添加布局的方法2 addView. LinearLayout ll = (LinearLayout)this.getLayoutInflater().inflate(R.layout.main1,null); setContentView(ll); LinearLayout ll2 = (LinearLayout)this.getLayoutInflater().inflate(R.layout.main2,null); ll.addView(ll2);

3. android中怎么动态的加载一个布局

由于前段时间项目需要，需要在一个页面上加载根据不同的按钮加载不同的布局页面，当时想到用 tabhot 。不过美工提供的界面图完全用不上tabhot ，所以想到了动态加载的方法来解决这一需求。在这里我整理了一下，写了一个 DEMO 希望大家以后少走点弯路。

首先，我们先把界面的框架图画出来，示意图如下：

4. 关于Android动态布局添加和删除View的问题……

java">{

	privateLinearLayoutlayout;
	privateTextViewtextView;
	@Override
	publicvoidonCreate(BundlesavedInstanceState){
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		layout=newLinearLayout(this);//变量layout是该Activity的成员变量（privateLinearLayoutlayout）
		layout.setOrientation(LinearLayout.VERTICAL);//设置layout布局方向为垂直
		setContentView(layout);

		//接下来向layout中添加TextView
		textView=newTextView(this);
		textView.setText("ThisIsaTextView");
		layout.addView(textView);
	}
	@Override
	protectedvoidonResume(){
		//TODOAuto-generatedmethodstub
		layout.removeView(textView);
		super.onResume();
	}
	
}

但是Activity在启动的时候调用onCreate()之后也会调用onResume()方法，所以进入程序也看不到textview了

5. android涓娣诲姞澶撮儴瑙嗗浘镄勫姛鑳芥庝箞瀹炵幇

ListView鏄链塧ddHeaderView鍜 addFooterView涓や釜鏂规硶镄.
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椤圭洰鍦板潃锛埚埆浜哄啓镄勶纴闱炲崥涓荤殑锛https://github.com/jczmdeveloper/XCRecyclerView
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code

package com.xqx.com.recyclerviewheaderdemo;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;

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

public class XCRecyclerView extends RecyclerView{

private ArrayList<View> mHeaderViews = new ArrayList<>();
private ArrayList<View> mFooterViews = new ArrayList<>();
private RecyclerView.Adapter mAdapter;
private RecyclerView.Adapter mWrapAdapter;
private static final int TYPE_HEADER = -101;
private static final int TYPE_FOOTER = -102;
private static final int TYPE_LIST_ITEM = - 103;
public XCRecyclerView(Context context) {
this(context, null);
}
public XCRecyclerView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public XCRecyclerView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
private void init(Context context){

}

@Override
public void setAdapter(Adapter adapter) {
mAdapter = adapter;
mWrapAdapter = new WrapAdapter(mHeaderViews, mFooterViews, adapter);
super.setAdapter(mWrapAdapter);
mAdapter.registerAdapterDataObserver(mDataObserver);
}
public void addHeaderView(View view){
mHeaderViews.clear();
mHeaderViews.add(view);
}
public void addFooterView(View view){
mFooterViews.clear();
mFooterViews.add(view);
}
public int getHeaderViewsCount(){
return mHeaderViews.size();
}
public int getFooterViewsCount(){
return mFooterViews.size();
}
private final RecyclerView.AdapterDataObserver mDataObserver = new RecyclerView.AdapterDataObserver() {
@Override
public void onChanged() {
mWrapAdapter.notifyDataSetChanged();
}

@Override
public void onItemRangeChanged(int positionStart, int itemCount) {
mWrapAdapter.notifyItemRangeChanged(positionStart, itemCount);
}

// @Override
// public void onItemRangeChanged(int positionStart, int itemCount, Object payload) {
// mWrapAdapter.notifyItemRangeChanged(positionStart, itemCount, payload);
// }

@Override
public void onItemRangeInserted(int positionStart, int itemCount) {
mWrapAdapter.notifyItemRangeInserted(positionStart, itemCount);
}

@Override
public void onItemRangeMoved(int fromPosition, int toPosition, int itemCount) {
mWrapAdapter.notifyItemMoved(fromPosition, toPosition);
}

@Override
public void onItemRangeRemoved(int positionStart, int itemCount) {
mWrapAdapter.notifyItemRangeRemoved(positionStart, itemCount);
}
};
private class WrapAdapter extends RecyclerView.Adapter<ViewHolder>{

private Adapter mAdapter;
private List<View> mHeaderViews;
private List<View> mFooterViews;
public WrapAdapter(List<View> headerViews,List<View> footerViews,Adapter adapter){
this.mAdapter = adapter;
this.mHeaderViews = headerViews;
this.mFooterViews = footerViews;
}

public int getHeaderCount(){
return this.mHeaderViews.size();
}
public int getFooterCount(){
return this.mFooterViews.size();
}
public boolean isHeader(int position){
return position >= 0 && position < this.mHeaderViews.size();
}
public boolean isFooter(int position){
return position < getItemCount() && position >= getItemCount() - this.mFooterViews.size();
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if(viewType == TYPE_HEADER){
return new CustomViewHolder(this.mHeaderViews.get(0));
}else if(viewType == TYPE_FOOTER){
return new CustomViewHolder(this.mFooterViews.get(0));
}else{
return this.mAdapter.onCreateViewHolder(parent,viewType);
}
}

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
if(isHeader(position)) return;
if(isFooter(position)) return;
int rePosition = position - getHeaderCount();
int itemCount = this.mAdapter.getItemCount();
if(this.mAdapter != null){
if(rePosition < itemCount){
Log.v("czm","rePosition/itemCount="+rePosition+"/"+itemCount);
this.mAdapter.onBindViewHolder(holder,rePosition);
return;
}
}
}
@Override
public long getItemId(int position) {
if (this.mAdapter != null && position >= getHeaderCount()) {
int rePosition = position - getHeaderCount();
int itemCount = this.mAdapter.getItemCount();
if (rePosition < itemCount) {
return this.mAdapter.getItemId(rePosition);
}
}
return -1;
}
@Override
public int getItemViewType(int position) {
if(isHeader(position)){
return TYPE_HEADER;
}
if(isFooter(position)){
return TYPE_FOOTER;
}
int rePosition = position - getHeaderCount();
int itemCount = this.mAdapter.getItemCount();
if(rePosition < itemCount){
return this.mAdapter.getItemViewType(position);
}
return TYPE_LIST_ITEM;
}
@Override
public int getItemCount() {
if(this.mAdapter != null){
return getHeaderCount() + getFooterCount() + this.mAdapter.getItemCount();
}else{
return getHeaderCount() + getFooterCount();
}
}

@Override
public void registerAdapterDataObserver(AdapterDataObserver observer) {
if(this.mAdapter != null){
this.mAdapter.registerAdapterDataObserver(observer);
}
}

@Override
public void unregisterAdapterDataObserver(AdapterDataObserver observer) {
if(this.mAdapter != null){
this.mAdapter.unregisterAdapterDataObserver(observer);
}
}

private class CustomViewHolder extends ViewHolder{

public CustomViewHolder(View itemView) {
super(itemView);
}
}
}
}

XCRecyclerView
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code

private MyAdapter mAdapter;
private XCRecyclerView mRecyclerView;
private List<String> mData;
private View mHeaderView;
private View mFooterView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mData = new ArrayList<String>();
for(int i = 0; i < 10 ;i++){
mData.add("item_" + i);
}
mAdapter = new MyAdapter(mData);
mRecyclerView = (XCRecyclerView) findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mHeaderView = LayoutInflater.from(this).inflate(R.layout.layout_header,mRecyclerView,false);
mFooterView = LayoutInflater.from(this).inflate(R.layout.layout_footer,mRecyclerView,false);
mRecyclerView.addHeaderView(mHeaderView);
mRecyclerView.addFooterView(mFooterView);
mRecyclerView.setAdapter(mAdapter);
}

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