效果图
首先创建ThreeColorLayout类继承ViewGroup
import android.content.Context; import android.util.AttributeSet; import android.util.DisplayMetrics; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import android.widget.Toast; public class ThreeColorLayout extends ViewGroup { //声明点击事件对象 private ChildClickListener childClickListener; public ThreeColorLayout(Context context) { super(context); } public ThreeColorLayout(Context context, AttributeSet attrs) { super(context, attrs); } public ThreeColorLayout(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } /** * 测量 * * @param widthMeasureSpec * @param heightMeasureSpec */ @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); //子view摆放的起始位置 int allLeft = 0; //存储所有行的高度相加，用于确定此容器的高度 int allHeight = 0; //测量子View的宽高 int childCount = getChildCount(); //判断childCount，防止childCount为0遍历报错 if (childCount > 0) { //遍历子控件 for (int i = 0; i < childCount; i++) { //得到子控件 View child = getChildAt(i); //测量子View高 allHeight += child.getMeasuredHeight(); //给子控件添加测量标准 measureChild(child, widthMeasureSpec, heightMeasureSpec); } } //获取屏幕宽度 DisplayMetrics metrics = getContext().getResources().getDisplayMetrics(); //子控件最大宽度是屏幕宽度 allLeft = metrics.widthPixels; //设置ThreeColorLayout容器的宽高 setMeasuredDimension(allLeft, allHeight); } /** * 布局 * * @param changed * @param l 左 * @param t 上 * @param r 右 * @param b 下 */ @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { //测量子View的宽高 int childCount = getChildCount(); //子view摆放的起始位置 int allLeft = 0; //存储所有行的高度相加，用于确定此容器的高度 int allHeight = 0; //遍历子View for (int i = 0; i < childCount; i++) { //获取子View View child = getChildAt(i); //子View的摆放位置 child.layout(allLeft, allHeight, allLeft + child.getMeasuredWidth(), allHeight + child.getMeasuredHeight()); //摆放子view allLeft += getChildAt(i).getMeasuredWidth(); allHeight += child.getMeasuredHeight(); //屏幕宽度 DisplayMetrics metrics = getContext().getResources().getDisplayMetrics(); int widthPixels = metrics.widthPixels; //判断子View宽度是否大于屏幕宽度，大于则换行 if (allLeft + child.getMeasuredWidth() > widthPixels) { //子View初始位置归0，回到最左边 allLeft = 0; } //给子View添加点击事件 child.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { TextView textView = (TextView) v; //实现自定义接口 childClickListener.childClick(textView); } }); //给子View添加长按事件 child.setOnLongClickListener(new OnLongClickListener() { @Override public boolean onLongClick(View v) { TextView textView = (TextView) v; Toast.makeText(getContext(), textView.getText().toString(), Toast.LENGTH_SHORT).show(); //长按删除子View removeView(v); return true; } }); } } /** * 点击事件暴露给外面使用 * * @param childClickListener */ public void setChildClickListener(ChildClickListener childClickListener) { this.childClickListener = childClickListener; } /** * 点击事件接口 */ public interface ChildClickListener { void childClick(View v); } }
在布局文件里应用
<?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"> <Button android:id="@+id/btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!" /> <Button android:id="@+id/addbtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="增加" android:layout_alignParentRight="true"/> <example.com.lianxi20180529.ThreeColorLayout android:id="@+id/mvg" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="5dp" android:layout_below="@+id/btn"> </example.com.lianxi20180529.ThreeColorLayout> </RelativeLayout>
在MainActivity中设置......
import android.animation.ObjectAnimator; import android.content.Intent; import android.graphics.Color; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.util.DisplayMetrics; import android.util.Log; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends AppCompatActivity implements View.OnClickListener { private ThreeColorLayout mMvg; /** * 增加 */ private Button mAddbtn; private int count; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { mMvg = (ThreeColorLayout) findViewById(R.id.mvg); mAddbtn = (Button) findViewById(R.id.addbtn); mAddbtn.setOnClickListener(this); //设置点击事件 mMvg.setChildClickListener(new ThreeColorLayout.ChildClickListener() { @Override public void childClick(View v) { TextView textView = (TextView) v; String str = textView.getText().toString(); Toast.makeText(MyApp.context, textView.getText().toString(), Toast.LENGTH_SHORT).show(); Log.e("TextView -------->", str); } }); } @Override public void onClick(View v) { switch (v.getId()) { default: break; case R.id.addbtn: ++count; //获取屏幕宽度 DisplayMetrics metrics = this.getResources().getDisplayMetrics(); int widthPixels = metrics.widthPixels; TextView tv = new TextView(MyApp.context); //设置控件文本 tv.setText(count + ""); //设置控件文本居中显示 tv.setGravity(Gravity.CENTER); //设置控件文本字体颜色 tv.setTextColor(Color.BLACK); //设置控件背景颜色 if (count % 3 == 1) { tv.setBackgroundColor(Color.RED); } else if (count % 3 == 2) { tv.setBackgroundColor(Color.YELLOW); } else { tv.setBackgroundColor(Color.BLUE); } //给控件添加平移动画 ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(tv, "translationX", (widthPixels - widthPixels / 3), 0f); objectAnimator.setDuration(1000); objectAnimator.start(); //添加子View mMvg.addView(tv); //得到view的属性参数 ViewGroup.LayoutParams params = tv.getLayoutParams(); //设置子View宽高----宽是屏幕的1/3 params.width = widthPixels / 3; params.height = 50; tv.setLayoutParams(params); Log.e("TextView -------->", tv.getText().toString()); break; } } }
完成*********