2
我創建了自定義視圖，它擴展了FrameLayout。添加入的RelativeLayout後它被顯示爲兩個嵌套的觀點：自定義視圖顯示爲組件樹中的嵌套視圖
它是正常的嗎？它有時會用wrap_content標誌混亂，但我無法弄清楚爲什麼。當我使用View作爲基類時，一切看起來都很正常。
這裏是我的代碼：
MainActivity.java
package com.example.app;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.SeekBar;
import com.codersmill.tset.R;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
activity_main.xml中
<RelativeLayout 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"
tools:context=".MainActivity">
<com.example.app.RateBar
android:layout_width="match_parent"
android:layout_height="48dp"
android:id="@+id/rateBar"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"/>
</RelativeLayout>
RateBar.java
package com.example.app;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.TextView;
import com.codersmill.tset.R;
public class RateBar extends FrameLayout {
TextView star1, star2, star3, star4, star5;
View dot;
private boolean isAnimating = false;
int radius = 36;
private int step = 100;
private int leftMargin = 50;
private int topMargin = 0;
private int currentPosition = 0;
public RateBar(Context context) {
this(context, null);
}
public RateBar(Context context, AttributeSet attrs) {
super(context, attrs);
View.inflate(context, R.layout.view_rate_bar, this);
star1 = (TextView) this.findViewById(R.id.star1);
star2 = (TextView) this.findViewById(R.id.star2);
star3 = (TextView) this.findViewById(R.id.star3);
star4 = (TextView) this.findViewById(R.id.star4);
star5 = (TextView) this.findViewById(R.id.star5);
star1.setOnClickListener(onClickListener);
star2.setOnClickListener(onClickListener);
star3.setOnClickListener(onClickListener);
star4.setOnClickListener(onClickListener);
star5.setOnClickListener(onClickListener);
dot = this.findViewById(R.id.selector);
}
public RateBar(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs);
}
private OnClickListener onClickListener = new OnClickListener() {
@Override public void onClick(View v) {
if(isAnimating) return;
switch (v.getId()) {
case R.id.star1:
animateToPosition(0);
break;
case R.id.star2:
animateToPosition(1);
break;
case R.id.star3:
animateToPosition(2);
break;
case R.id.star4:
animateToPosition(3);
break;
case R.id.star5:
animateToPosition(4);
break;
}
}
};
@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
step = (int) (getMeasuredWidth()/5.0f);
leftMargin = (int) (step/2.0f - radius);
topMargin = (int) (getMeasuredHeight()/2.0f - radius);
if(!isAnimating) {
FrameLayout.LayoutParams params = (LayoutParams) dot.getLayoutParams();
params.leftMargin = leftMargin + currentPosition * step;
params.topMargin = topMargin;
dot.setLayoutParams(params);
}
}
private void animateToPosition(final int position) {
final int from = currentPosition*step + leftMargin;
final int to = position*step + leftMargin;
ValueAnimator animation = ValueAnimator.ofInt(from, to);
animation.setDuration(250);
animation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override public void onAnimationUpdate(ValueAnimator animation) {
FrameLayout.LayoutParams params = (LayoutParams) dot.getLayoutParams();
params.leftMargin = (int) animation.getAnimatedValue();
params.topMargin = topMargin;
dot.setLayoutParams(params);
}
});
animation.addListener(new AnimatorListenerAdapter() {
@Override public void onAnimationStart(Animator animation) {
super.onAnimationStart(animation);
isAnimating = true;
FrameLayout.LayoutParams params = (LayoutParams) dot.getLayoutParams();
params.topMargin = topMargin;
params.leftMargin = currentPosition * step + leftMargin;
dot.setLayoutParams(params);
}
@Override public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
isAnimating = false;
currentPosition = position;
FrameLayout.LayoutParams params = (LayoutParams) dot.getLayoutParams();
params.leftMargin = currentPosition * step + leftMargin;
params.topMargin = topMargin;
dot.setLayoutParams(params);
}
});
animation.start();
}
private void updateDotPosition() {
}
}
view_rate_bar.xml
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="wrap_content">
<View
android:id="@+id/selector"
android:layout_width="24dp"
android:layout_height="24dp"
android:background="@drawable/oval"
/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="1"
android:id="@+id/star1"
android:layout_weight="1"
android:gravity="center"
android:padding="12dp"
android:background="#2200ff00"/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="2"
android:id="@+id/star2"
android:layout_weight="1"
android:gravity="center"
android:padding="12dp"
android:background="#22ff0000"/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="3"
android:id="@+id/star3"
android:layout_weight="1"
android:gravity="center"
android:padding="12dp"
android:background="#2200ff00"/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="4"
android:id="@+id/star4"
android:layout_weight="1"
android:gravity="center"
android:padding="12dp"
android:background="#22ff0000"/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="5"
android:id="@+id/star5"
android:layout_weight="1"
android:gravity="center"
android:padding="12dp"
android:background="#2200ff00" />
</LinearLayout>
</merge>