RecyclerView+OKhttp三大布局與網路請求資料
阿新 • • 發佈:2019-01-31
展示一下今天要給大家分享的程式碼效果
先整個xml佈局
<?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:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height ="match_parent"
tools:context="sizu.wuxiaorui20171013.MainActivity">
<LinearLayout
android:id="@+id/app_top"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<Button
android:id ="@+id/add"
style="@style/AppButton"
android:text="新增"
/>
<Button
android:id="@+id/del"
style="@style/AppButton"
android:text="刪除"
/>
<Button
android:id="@+id/list"
style="@style/AppButton"
android:text="List"
/>
<Button
android:id="@+id/grid"
style="@style/AppButton"
android:text="Grid"
/>
<Button
android:id="@+id/flow"
style="@style/AppButton"
android:text="流氏"
/>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/id_recyclerview"
android:dividerHeight="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/app_top"
/>
</RelativeLayout>
然後把OKhttp要是用的工具包utils與app工具包複製到工程
擴充套件butterknife 工具使用
第一步(工程裡的buildgradle)
classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
app專案中的buildgradle
apply plugin: 'android-apt'
app專案中的buildgradle加的依賴
compile 'com.jakewharton:butterknife:8.2.1'
apt 'com.jakewharton:butterknife-compiler:8.2.1'
主類裡面初始化
以下是app專案中的buildgradle加的所有依賴
testCompile 'junit:junit:4.12'
compile 'com.android.support:mediarouter-v7:25.0.0'
compile 'com.android.support:appcompat-v7:25.0.0'
compile 'com.android.support:recyclerview-v7:25.0.0'
compile 'com.jakewharton:butterknife:8.2.1'
apt 'com.jakewharton:butterknife-compiler:8.2.1'
compile files('libs/universal-image-loader-1.9.3.jar')
compile 'com.squareup.okio:okio:1.5.0'
compile 'com.squareup.okhttp3:okhttp:3.2.0'
compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'
compile files('libs/gson-2.3.1.jar')
在配置清單中新增許可權
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
在application中加app的許可權
android:name="MyApp.MyApp"
然後建立幾個工具類
DividerGridItemDecoration
public class DividerGridItemDecoration extends RecyclerView.ItemDecoration
{
private static final int[] ATTRS = new int[] { android.R.attr.listDivider };
private Drawable mDivider;
public DividerGridItemDecoration(Context context)
{
final TypedArray a = context.obtainStyledAttributes(ATTRS);
mDivider = a.getDrawable(0);
a.recycle();
}
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state)
{
drawHorizontal(c, parent);
drawVertical(c, parent);
}
private int getSpanCount(RecyclerView parent)
{
// 列數
int spanCount = -1;
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager)
{
spanCount = ((GridLayoutManager) layoutManager).getSpanCount();
} else if (layoutManager instanceof StaggeredGridLayoutManager)
{
spanCount = ((StaggeredGridLayoutManager) layoutManager)
.getSpanCount();
}
return spanCount;
}
public void drawHorizontal(Canvas c, RecyclerView parent)
{
int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++)
{
final View child = parent.getChildAt(i);
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
.getLayoutParams();
final int left = child.getLeft() - params.leftMargin;
final int right = child.getRight() + params.rightMargin
+ mDivider.getIntrinsicWidth();
final int top = child.getBottom() + params.bottomMargin;
final int bottom = top + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
public void drawVertical(Canvas c, RecyclerView parent)
{
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++)
{
final View child = parent.getChildAt(i);
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
.getLayoutParams();
final int top = child.getTop() - params.topMargin;
final int bottom = child.getBottom() + params.bottomMargin;
final int left = child.getRight() + params.rightMargin;
final int right = left + mDivider.getIntrinsicWidth();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
private boolean isLastColum(RecyclerView parent, int pos, int spanCount,
int childCount)
{
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager)
{
if ((pos + 1) % spanCount == 0)// 如果是最後一列,則不需要繪製右邊
{
return true;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager)
{
int orientation = ((StaggeredGridLayoutManager) layoutManager)
.getOrientation();
if (orientation == StaggeredGridLayoutManager.VERTICAL)
{
if ((pos + 1) % spanCount == 0)// 如果是最後一列,則不需要繪製右邊
{
return true;
}
} else
{
childCount = childCount - childCount % spanCount;
if (pos >= childCount)// 如果是最後一列,則不需要繪製右邊
return true;
}
}
return false;
}
private boolean isLastRaw(RecyclerView parent, int pos, int spanCount,
int childCount)
{
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager)
{
childCount = childCount - childCount % spanCount;
if (pos >= childCount)// 如果是最後一行,則不需要繪製底部
return true;
} else if (layoutManager instanceof StaggeredGridLayoutManager)
{
int orientation = ((StaggeredGridLayoutManager) layoutManager)
.getOrientation();
// StaggeredGridLayoutManager 且縱向滾動
if (orientation == StaggeredGridLayoutManager.VERTICAL)
{
childCount = childCount - childCount % spanCount;
// 如果是最後一行,則不需要繪製底部
if (pos >= childCount)
return true;
} else
// StaggeredGridLayoutManager 且橫向滾動
{
// 如果是最後一行,則不需要繪製底部
if ((pos + 1) % spanCount == 0)
{
return true;
}
}
}
return false;
}
@Override
public void getItemOffsets(Rect outRect, int itemPosition,
RecyclerView parent)
{
int spanCount = getSpanCount(parent);
int childCount = parent.getAdapter().getItemCount();
if (isLastRaw(parent, itemPosition, spanCount, childCount))// 如果是最後一行,則不需要繪製底部
{
outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
} else if (isLastColum(parent, itemPosition, spanCount, childCount))// 如果是最後一列,則不需要繪製右邊
{
outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
} else
{
outRect.set(0, 0, mDivider.getIntrinsicWidth(),
mDivider.getIntrinsicHeight());
}
}
DividerItemDecoration
public class DividerItemDecoration extends RecyclerView.ItemDecoration {
private static final int[] ATTRS = new int[]{
android.R.attr.listDivider
};
public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
private Drawable mDivider;
private int mOrientation;
public DividerItemDecoration(Context context, int orientation) {
final TypedArray a = context.obtainStyledAttributes(ATTRS);
mDivider = a.getDrawable(0);
a.recycle();
setOrientation(orientation);
}
public void setOrientation(int orientation) {
if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
throw new IllegalArgumentException("invalid orientation");
}
mOrientation = orientation;
}
@Override
public void onDraw(Canvas c, RecyclerView parent) {
if (mOrientation == VERTICAL_LIST) {
drawVertical(c, parent);
} else {
drawHorizontal(c, parent);
}
}
public void drawVertical(Canvas c, RecyclerView parent) {
final int left = parent.getPaddingLeft();
final int right = parent.getWidth() - parent.getPaddingRight();
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = parent.getChildAt(i);
android.support.v7.widget.RecyclerView v = new android.support.v7.widget.RecyclerView(parent.getContext());
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
.getLayoutParams();
final int top = child.getBottom() + params.bottomMargin;
final int bottom = top + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
public void drawHorizontal(Canvas c, RecyclerView parent) {
final int top = parent.getPaddingTop();
final int bottom = parent.getHeight() - parent.getPaddingBottom();
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = parent.getChildAt(i);
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
.getLayoutParams();
final int left = child.getRight() + params.rightMargin;
final int right = left + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
@Override
public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
if (mOrientation == VERTICAL_LIST) {
outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
} else {
outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
}
}
SpacesItemDecoration(設定間距)
public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
private int space;
public SpacesItemDecoration(int space) {
this.space=space;
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
outRect.left=space;
outRect.right=space;
outRect.bottom=space;
if(parent.getChildAdapterPosition(view)==0){
outRect.top=space;
}
}
OnItemClickLitener
public interface OnItemClickLitener
{
void onItemClick(View view, int position);
void onItemLongClick(View view , int position);
}
MainActivity
private RecyclerView mRecyclerView;
private List<String> mDatas;
private HomeAdapter mAdapter;
private String gsonFrom="你的網路資料介面";
private boolean isPubu = false;
private List<MyGsonFr.NewslistBean> data;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
/*獲得RecyclerView的id*/
mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview);
initData();
/*自定義分割線*/
mRecyclerView.addItemDecoration(new DividerGridItemDecoration(this));
//設定Item增加、移除動畫
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
//設定item之間的間隔
SpacesItemDecoration decoration = new SpacesItemDecoration(16);
mRecyclerView.addItemDecoration(decoration);
}
protected void initData() {
/*mDatas = new ArrayList<String>();
for (int i = 'A'; i < 'z'; i++) {
mDatas.add("" + (char) i);
}*/
OkHttp3Utils.getInstance().doGet(gsonFrom, new GsonObjectCallback<MyGsonFr>(){
@Override
public void onUi(MyGsonFr myGsonfr) {
data=new ArrayList<MyGsonFr.NewslistBean>();
data=myGsonfr.getNewslist();
mRecyclerView.setAdapter(mAdapter = new HomeAdapter());
mAdapter.setOnItemClickLitener(new OnItemClickLitener()
{
@Override
public void onItemClick(View view, int position)
{
Toast.makeText(MainActivity.this, position + " click",
Toast.LENGTH_SHORT).show();
}
@Override
public void onItemLongClick(View view, int position)
{
Toast.makeText(MainActivity.this, position + " long click",
Toast.LENGTH_SHORT).show();
mAdapter.removeData(position);
}
});
}
@Override
public void onFailed(Call call, IOException e) {
}
});
}
@OnClick({R.id.add, R.id.del, R.id.list, R.id.grid, R.id.flow})
public void onViewClicked(View view) {
switch (view.getId()) {
case R.id.add:
mDatas.add(1, "Insert One");
mAdapter.notifyItemInserted(1);
break;
case R.id.del:
data.remove(1);
mAdapter.notifyItemRemoved(1);
break;
case R.id.list:
isPubu = false;
// listview佈局
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
break;
case R.id.grid:
isPubu = false;
// Gridview佈局
mRecyclerView.setLayoutManager(new GridLayoutManager(this,4));
break;
case R.id.flow:
isPubu = true;
// 瀑布式佈局
mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL));
break;
}
}
class HomeAdapter extends RecyclerView.Adapter<HomeAdapter.MyViewHolder> {
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
MyViewHolder holder = new MyViewHolder(LayoutInflater.from(
MainActivity.this).inflate(R.layout.item_home, parent,
false));
return holder;
}
private OnItemClickLitener mOnItemClickLitener;
public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener)
{
this.mOnItemClickLitener = mOnItemClickLitener;
}
@Override
public void onBindViewHolder(final MyViewHolder holder, int position) {
holder.tv.setText(data.get(position).getTitle());
if (isPubu){
ViewGroup.LayoutParams layoutParams = holder.tv.getLayoutParams();
double v = Math.random() * 100;
layoutParams.height = (int) v;
holder.tv.setLayoutParams(layoutParams);
}
// 如果設定了回撥,則設定點選事件
if (mOnItemClickLitener != null)
{
holder.itemView.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
int pos = holder.getLayoutPosition();
mOnItemClickLitener.onItemClick(holder.itemView, pos);
}
});
holder.itemView.setOnLongClickListener(new View.OnLongClickListener()
{
@Override
public boolean onLongClick(View v)
{
int pos = holder.getLayoutPosition();
mOnItemClickLitener.onItemLongClick(holder.itemView, pos);
return false;
}
});
}
}
@Override
public int getItemCount() {
return data.size();
}
public void addData(int position) {
data.add(position, new MyGsonFr.NewslistBean("Insert One","","","",""));
notifyItemInserted(position);
}
public void removeData(int position) {
data.remove(position);
notifyItemRemoved(position);
}
class MyViewHolder extends RecyclerView.ViewHolder {
TextView tv;
public MyViewHolder(View view) {
super(view);
tv = (TextView) view.findViewById(R.id.id_num);
}
}
}
item_home(item中的佈局)
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:background="#44ff0000"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/id_num"
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center"
android:text="1" />
</FrameLayout>
drawable(樣式)
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<gradient
android:centerColor="#ff00ff00"
android:endColor="#ff0000ff"
android:startColor="#ffff0000"
android:type="linear" />
<size android:height="4dp"/>
</shape>