输入框+流失布局

布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">

<EditText
android:id="@+id/et_main"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" />

<Button
android:id="@+id/btn_main"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="添加" />
</LinearLayout>

<com.jensen.flowlayout.FlowLayout
android:id="@+id/fl_main"
android:layout_width="match_parent"
android:layout_height="200dp">

</com.jensen.flowlayout.FlowLayout>

</LinearLayout>

FlowLayout

public class FlowLayout extends ViewGroup {
private static final String TAG = "FlowLayout++";

public FlowLayout(Context context) {
super(context);
}

public FlowLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}

public FlowLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);

//测量所有孩子的宽高
measureChildren(widthMeasureSpec, heightMeasureSpec);

//int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);//AT-MOST
//int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);

/*int width = 0;
int height = 0;
int lineWidth = 0;
//int lineHeight = 0;
int totalHeight = 0;//累加的高度
View childView;
int childWidth = 0;
int childHeight = 0;

for (int i = 0; i < getChildCount(); i++) {
childView = getChildAt(i);
childWidth = childView.getMeasuredWidth();
childHeight = childView.getMeasuredHeight();

//
if (childWidth > widthSize) {
Log.d(TAG, "onMeasure: 太大了");
}

//测量布局的宽
//换行/不换行
if (childWidth + lineWidth > widthSize) {
//换行
width = widthSize;
totalHeight += childHeight;

//第一个
//lineHeight = childHeight;
lineWidth = childWidth;
} else {
//不换行

lineWidth += childWidth;

//lineHeight = Math.max(lineHeight, childHeight);

width = Math.max(width, lineWidth);
}
*//* //测量高度
if (i == getChildCount() - 1) {
totalHeight += childHeight;
height = totalHeight;
}*//*
}

width = widthMode == MeasureSpec.EXACTLY ? widthSize : width;
height = heightMode == MeasureSpec.EXACTLY ? heightSize : height;*/

setMeasuredDimension(widthSize, heightSize);
}

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
int lineWidth = 0;
//int lineHeight = 0;
int totalHeight = 0;//累加的高度
View childView;
int childWidth = 0;
int childHeight = 0;

for (int i = 0; i < getChildCount(); i++) {
childView = getChildAt(i);
childWidth = childView.getMeasuredWidth();
childHeight = childView.getMeasuredHeight();

//测量布局的宽
//换行/不换行
if (childWidth + lineWidth > getMeasuredWidth()) {
//换行
totalHeight += childHeight;
lineWidth = 0;
childViewLayout(childView, lineWidth, totalHeight, lineWidth + childWidth, totalHeight + childHeight);
//第一个
//lineHeight = childHeight;
lineWidth = childWidth;
} else {
//不换行
childViewLayout(childView, lineWidth, totalHeight, lineWidth + childWidth, totalHeight + childHeight);

lineWidth += childWidth;

//lineHeight = Math.max(lineHeight, childHeight);

}
}
}

public void childViewLayout(View childView, int l, int t, int r, int b) {
childView.layout(l, t, r, b);
}

}

MainActivity

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private EditText mEtMain;
private Button mBtnMain;
private FlowLayout mFlMain;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}

private void initView() {
mEtMain = (EditText) findViewById(R.id.et_main);
mBtnMain = (Button) findViewById(R.id.btn_main);
mFlMain = (FlowLayout) findViewById(R.id.fl_main);

mBtnMain.setOnClickListener(this);
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_main:
submit();
break;
}
}

private void submit() {
// validate
String main = mEtMain.getText().toString().trim();
if (TextUtils.isEmpty(main)) {
Toast.makeText(this, "main不能为空", Toast.LENGTH_SHORT).show();
return;
} else {
TextView textView = new TextView(getApplicationContext());
textView.setText(main);
textView.setTextColor(Color.BLACK);
textView.setPadding(10, 10, 10, 10);
mFlMain.addView(textView);
}

// TODO validate success, do something

}
}

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