自定义View类
public class FlowLayout extends ViewGroup {
public FlowLayout(Context context) {
this(context,null);
}
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 onLayout(boolean changed, int l, int t, int r, int b) {
measureChildren(0,0);
int totalWidth = 0;
int totalHeight = 0;
for (int i = 0; i < getChildCount(); i++) {
View view = getChildAt(i);
if (totalWidth + view.getMeasuredWidth() >= getMeasuredWidth()) {
totalWidth = 0;
totalHeight += view.getMeasuredHeight();
}
view.layout(
totalWidth,
totalHeight,
totalWidth + view.getMeasuredWidth(),
totalHeight + view.getMeasuredHeight());
totalWidth += view.getMeasuredHeight();
}
}
}
MainActivity代码:
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private EditText et_text;
private Button btn_add;
private Button btn_decrease;
private FlowLayout flow;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
et_text = (EditText) findViewById(R.id.et_text);
btn_add = (Button) findViewById(R.id.btn_add);
btn_decrease = (Button) findViewById(R.id.btn_decrease);
flow = (FlowLayout) findViewById(R.id.flow);
btn_add.setOnClickListener(this);
btn_decrease.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_add:
addHistory();
break;
case R.id.btn_decrease:
flow.removeAllViews();
break;
}
}
private void addHistory() {
TextView txt = new TextView(this);
String s = et_text.getText().toString();
if (!TextUtils.isEmpty(s)) {
txt.setText("" + s);
// Toast.makeText(this,""+txt.getText(),Toast.LENGTH_LONG).show();
txt.setPadding(15, 15, 15, 15);
flow.addView(txt);
}
}
private void submit() {
// validate
String text = et_text.getText().toString().trim();
if (TextUtils.isEmpty(text)) {
Toast.makeText(this, "text不能为空", Toast.LENGTH_SHORT).show();
return;
}
}
}
布局中直接写自己的自定义控件即可