Android利用FlexboxLayout轻松实现流动布局

compile 'com.google.android:flexbox:0.2.2'

 <com.google.android.flexbox.FlexboxLayout
  android:id="@+id/flexbox_layout"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  app:flexWrap="wrap">
  <TextView
  android:id="@+id/tv1"
  android:layout_width="120dp"
  android:layout_height="80dp"
  app:layout_flexBasisPercent="50%" />
  <TextView
  android:id="@+id/tv2"
  android:layout_width="80dp"
  android:layout_height="80dp"
  app:layout_alignSelf="center"/>
  <TextView
  android:id="@+id/tv3"
  android:layout_width="160dp"
  android:layout_height="80dp"
  app:layout_alignSelf="flex_end"/>
 </com.google.android.flexbox.FlexboxLayout>

FlexboxLayout flexboxLayout = (FlexboxLayout) findViewById(R.id.flexbox_layout);
flexboxLayout.setFlexDirection(FlexboxLayout.FLEX_DIRECTION_COLUMN);
View view = flexboxLayout.getChildAt(0);
FlexboxLayout.LayoutParams lp = (FlexboxLayout.LayoutParams) view.getLayoutParams();
lp.order = -1;
lp.flexGrow = 2;
view.setLayoutParams(lp);

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 android:layout_width="match_parent"
 android:layout_height="match_parent">
 <com.google.android.flexbox.FlexboxLayout
  android:id="@+id/flexbox_layout"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  app:flexWrap="wrap" />
</RelativeLayout>

String[] tags = {"婚姻育儿", "散文", "设计", "上班这点事儿", "影视天堂", "大学生活", "美人说", "运动和健身", "工具癖", "生活家", "程序员", "想法", "短篇小说", "美食", "教育", "心理", "奇思妙想", "美食", "摄影"};
  flexboxLayout = (FlexboxLayout) findViewById(R.id.flexbox_layout);
  for (int i = 0; i < tags.length; i++) {
   Book model = new Book();
   model.setId(i);
   model.setName(tags[i]);
   flexboxLayout.addView(createNewFlexItemTextView(model));
  }

/**
  * 动态创建TextView
  * @param book
  * @return
  */
 private TextView createNewFlexItemTextView(final Book book) {
  TextView textView = new TextView(this);
  textView.setGravity(Gravity.CENTER);
  textView.setText(book.getName());
  textView.setTextSize(12);
  textView.setTextColor(getResources().getColor(R.color.colorAccent));
  textView.setBackgroundResource(R.drawable.tag_states);
  textView.setTag(book.getId());
  textView.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View view) {
    Log.e(TAG, book.getName());
   }
  });
  int padding = Util.dpToPixel(this, 4);
  int paddingLeftAndRight = Util.dpToPixel(this, 8);
  ViewCompat.setPaddingRelative(textView, paddingLeftAndRight, padding, paddingLeftAndRight, padding);
  FlexboxLayout.LayoutParams layoutParams = new FlexboxLayout.LayoutParams(
    ViewGroup.LayoutParams.WRAP_CONTENT,
    ViewGroup.LayoutParams.WRAP_CONTENT);
  int margin = Util.dpToPixel(this, 6);
  int marginTop = Util.dpToPixel(this, 16);
  layoutParams.setMargins(margin, marginTop, margin, 0);
  textView.setLayoutParams(layoutParams);
  return textView;
 }

public class Book {
 private int id;
 private String name;
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public int getId() {
  return id;
 }
 public void setId(int id) {
  this.id = id;
 }
 public Book() {
 }
}

public class Util {
 public static int pixelToDp(Context context, int pixel) {
  DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
  return pixel < 0 ? pixel : Math.round(pixel / displayMetrics.density);
 }
 public static int dpToPixel(Context context, int dp) {
  DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
  return dp < 0 ? dp : Math.round(dp * displayMetrics.density);
 }
}