前言
以前總是在CSDN上看各位前輩的精彩博客,從中也學習了很多東西。其實自己也一直想寫博客,直到今天終於要踏出這一步了,有點小興奮,哈哈!不足之處,還請各位同仁不吝賜教,拜謝!!!
話不多說,工作中我們時常會遇到頻道管理的需求,不少博客使用GridView實現這一功能,個人喜歡用自定義的GridLayout實現,蘿蔔白菜各有所愛,嘿嘿。
功能
要實現的功能如上圖所示(當然,左邊只是一個參考,這裏界面不是重點,我們要實現這個功能)
1. 分上下兩部分
2.“我的頻道”實現了長按拖拽排序功能;同時,點擊某一子條目時,將該條目從“我的頻道”中刪除,添加到“更多頻道”中。
3.“更多頻道”實現了點擊事件,當點擊某一子條目時,該子條目從“更多頻道”中刪除,添加到“我的頻道”中。
實現代碼
主程序代碼:
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private DragGridLayout showGridLayout;
private DragGridLayout hideGridLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initCustom();
}
private void initCustom() {
showGridLayout = (DragGridLayout) findViewById(R.id.dgl_main_show);
showGridLayout.setResource(R.drawable.selector_textbg, 10, 5);
showGridLayout.setEnableDrag(true);
List<String> items = new ArrayList<>();
items.add("推薦");
items.add("本地事");
items.add("本地人");
items.add("社區");
items.add("圖集");
items.add("要聞");
items.add("熱點");
items.add("旅遊");
items.add("健康");
showGridLayout.setItems(items);
hideGridLayout = (DragGridLayout) findViewById(R.id.dgl_main_bottom);
hideGridLayout.setEnableDrag(false);
hideGridLayout.setResource(R.drawable.selector_textbg, 10, 5);
List<String> items1 = new ArrayList<>();
items1.add("家居");
items1.add("奇石");
items1.add("螺螄粉");
items1.add("情感");
items1.add("文化");
items1.add("體育");
items1.add("汽車");
items1.add("本地號");
items1.add("爆料");
items1.add("時政");
items1.add("美女");
items1.add("公益");
items1.add("公民榜樣");
items1.add("親子");
items1.add("社會");
items1.add("舌尖柳州");
items1.add("開心一刻");
items1.add("居柳州");
hideGridLayout.setItems(items1);
//設置點擊事件
showGridLayout.setOnItemClickListener(new DragGridLayout.OnItemClickListener() {
@Override
public void onItemClick(TextView tv) {
//當點擊時,將返回的TextView從showGridLayout容器中刪除,在添加到hideGridLayout中
showGridLayout.removeView(tv);
hideGridLayout.addItem(tv.getText().toString());
}
});
hideGridLayout.setOnItemClickListener(new DragGridLayout.OnItemClickListener() {
@Override
public void onItemClick(TextView tv) {
hideGridLayout.removeView(tv);
showGridLayout.addItem(tv.getText().toString());
}
});
}
}
佈局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPry"
android:text="點擊增刪頻道,長按拖拽排序"/>
<com.example.customview.DragGridLayout
android:id="@+id/dgl_main_show"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</com.example.customview.DragGridLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPry"
android:text="頻道管理"/>
<com.example.customview.DragGridLayout
android:id="@+id/dgl_main_bottom"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</com.example.customview.DragGridLayout>
</LinearLayout>
</LinearLayout>
自定義GridLayout:
註釋比較詳細了,直接上代碼,其中的一些參數,例如margin和padding,可根據項目需求,具體定製。
import android.animation.LayoutTransition;
import android.content.Context;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.DragEvent;
import android.view.Gravity;
import android.view.View;
import android.widget.GridLayout;
import android.widget.TextView;
import java.util.List;
/**
* Created by ZLM on 2017/4/3.
*/
public class DragGridLayout extends GridLayout {
private boolean ableDrag;
private Rect[] rects;
private View dragView;
private OnItemClickListener itemClickListener;
//拖拽監聽
private View.OnDragListener odl = new View.OnDragListener() {
@Override
public boolean onDrag(View view, DragEvent dragEvent) {
switch (dragEvent.getAction()) {
case DragEvent.ACTION_DRAG_STARTED:
//當拖拽事件產生時,給每個子控件創建出對應的矩形
initRects();
break;
case DragEvent.ACTION_DRAG_LOCATION:
//當手指移動時,判斷當前進入了哪一個子控件範圍內,並返回對應子控件的索引
int touchIndex = getTouchIndex(dragEvent);
if (touchIndex > -1 && dragView != null && dragView != DragGridLayout.this.getChildAt(touchIndex)) {
//先把拖拽的view從當前位置刪除,再添加到touchIndex上
DragGridLayout.this.removeView(dragView);
DragGridLayout.this.addView(dragView, touchIndex);
}
break;
case DragEvent.ACTION_DRAG_ENDED:
if (dragView != null) {
dragView.setEnabled(true);
}
break;
default:
break;
}
return true;
}
};
//長按監聽
private View.OnLongClickListener olcl = new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
//長按事件發生時,即給dragView賦值
dragView = view;
//拖拽事件
view.startDrag(null, new View.DragShadowBuilder(view), null, 0);
view.setEnabled(false);
return false;
}
};
private int getTouchIndex(DragEvent dragEvent) {
for (int i = 0; i < rects.length; i++) {
Rect rect = rects[i];
if (rect.contains((int) dragEvent.getX(), (int) dragEvent.getY())) {
return i;
}
}
return -1;
}
//創建子控件對應的矩形
private void initRects() {
//給容器中的每一個子控件都新建一個矩形
rects = new Rect[getChildCount()];
for (int i = 0; i < getChildCount(); i++) {
View childAt = getChildAt(i);
rects[i] = new Rect(childAt.getLeft(), childAt.getTop(), childAt.getRight(), childAt.getBottom());
}
}
public DragGridLayout(Context context) {
this(context, null);
}
public DragGridLayout(Context context, AttributeSet attrs) {
super(context, attrs);
setColumnCount(4);
setLayoutTransition(new LayoutTransition());
}
//定義方法,由外部傳遞一個欄目的數據集合進來,在這裏根據數據集合動態創建表格界面
public void setItems(List<String> items) {
for (String item : items) {
addItem(item);
}
}
//定義方法,設置是否允許拖拽
public void setEnableDrag(boolean EnableDrag) {
ableDrag = EnableDrag;
if (ableDrag) {
setOnDragListener(odl);
} else {
setOnDragListener(null);
}
}
//定義接口回調
public interface OnItemClickListener {
public void onItemClick(TextView tv);
}
public void setOnItemClickListener(OnItemClickListener listener) {
this.itemClickListener = listener;
}
public void addItem(String item) {
TextView tv = getNewTextView();
tv.setText(item);
this.addView(tv);
}
//定義方法,外部傳入子條目的背景資源Id,外邊距margin(px),tv內邊距padding(px)
private final float scale = getContext().getResources().getDisplayMetrics().density;
private int resId;
private int margin;
private int padding;
public void setResource(int ResourceId, int margin, int padding) {
this.resId = ResourceId;
this.margin = (int) (margin * scale + 0.5f);
this.padding = (int) (padding * scale + 0.5f);
}
public TextView getNewTextView() {
GridLayout.LayoutParams layoutParams = new GridLayout.LayoutParams();
layoutParams.width = getResources().getDisplayMetrics().widthPixels / 4 - 2 * margin;
layoutParams.height = GridLayout.LayoutParams.WRAP_CONTENT;
layoutParams.setMargins(margin, margin, margin, margin);
TextView tv = new TextView(getContext());
tv.setLayoutParams(layoutParams);
tv.setGravity(Gravity.CENTER);
tv.setBackgroundResource(resId);
tv.setPadding(padding, padding, padding, padding);
if (ableDrag) {
tv.setOnLongClickListener(olcl);
} else {
tv.setOnLongClickListener(null);
}
tv.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
if (itemClickListener != null) {
itemClickListener.onItemClick((TextView) view);
}
}
});
return tv;
}
}
drawable/selector_textbg.xml:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_enabled="true" android:drawable="@drawable/shape_textbg_nomal"/>
<item android:state_enabled="false" android:drawable="@drawable/shape_textbg_pressed"/>
</selector>
drawable/shape_textbg_nomal.xml:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<stroke android:width="1dp" android:color="@color/colorBlack"/>
<corners android:radius="@dimen/dp8"/>
<solid android:color="@color/colorWhite"/>
</shape>
drawable/shape_textbg_pressed.xml:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<stroke android:width="1dp"
android:dashWidth="2dp"
android:dashGap="3dp"
android:color="@color/colorRed"/>
<corners android:radius="@dimen/dp8"/>
<solid android:color="@color/colorWhite"/>
</shape>