android自定义控件

项目中很多地方需要用到的一个标题，自己第一次封装一个控件

public class TopView extends LinearLayout implements OnClickListener {
private TextView mTvTitle, mTvRight;
private ImageView mImgRight, mImgLeft;
private int mTvColor;
private float mTvSize, mRightSize;
private String mTvText, mRightText;
private Drawable mImgLeftSrc, mImgRightSrc;
private TopViewListener mTopViewLeftListener = null,
mTopViewRightListener = null;
private boolean isRightShow, isLeftShow;

public TopView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray typedArray = context.obtainStyledAttributes(attrs,
R.styleable.topView);
mTvColor = typedArray.getColor(R.styleable.topView_TopViewColor,
context.getResources().getColor(R.color.white));
mTvSize = typedArray.getDimensionPixelSize(
R.styleable.topView_TopViewSize, 20);
mRightSize = typedArray.getDimensionPixelSize(
R.styleable.topView_RightSize, 0);
mTvText = typedArray.getString(R.styleable.topView_TopViewText);
mRightText = typedArray.getString(R.styleable.topView_RightText);
mImgLeftSrc = typedArray.getDrawable(R.styleable.topView_LeftSrc);
mImgRightSrc = typedArray.getDrawable(R.styleable.topView_RightSrc);
isRightShow = typedArray.getBoolean(R.styleable.topView_isRightShow,
true);
isLeftShow = typedArray
.getBoolean(R.styleable.topView_isLeftShow, true);

DisplayMetrics dm = getScreenParams(context);
int densityDPI = dm.densityDpi;
computeTextSize(densityDPI);

LayoutInflater.from(context).inflate(R.layout.topview, this);

mTvTitle = (TextView) this.findViewById(R.id.tv_title);
mImgLeft = (ImageView) this.findViewById(R.id.img_left);
mImgRight = (ImageView) this.findViewById(R.id.img_right);
mTvRight = (TextView) this.findViewById(R.id.tv_right);
LinearLayout layout = (LinearLayout) this.findViewById(R.id.layout);

mTvTitle.setTextColor(mTvColor);
mTvTitle.setTextSize(mTvSize);
mTvTitle.setText(mTvText);
mTvRight.setTextSize(mRightSize);
mTvRight.setText(mRightText);
mImgLeft.setImageDrawable(mImgLeftSrc);
if (isLeftShow) {
mImgLeft.setVisibility(View.VISIBLE);
} else {
mImgLeft.setVisibility(View.GONE);
}
mImgLeft.setOnClickListener(this);
mImgRight.setImageDrawable(mImgRightSrc);
layout.setOnClickListener(this);
if (isRightShow) {
layout.setVisibility(View.VISIBLE);
} else {
layout.setVisibility(View.GONE);
}
typedArray.recycle();
}

/**
* 根据不同屏幕密度计算字体大小
*
* Because... NORMAL is NOT hdpi... Normal is mdpi (160dpi) = 1.0x. hdpi
* (240dpi) is 1.5x. xhdpi (320dpi) is 2.0x. xxdpi (480dpi) is 3.0x. xxxhdpi
* (640dpi) is 4.0x. And (last, but not least) ldpi (120dpi) is 0.75x.
*/
private void computeTextSize(int dpi) {
switch (dpi) {
case 120:
mTvSize = (float) (mTvSize / 0.75);
mRightSize = (float) (mRightSize / 0.75);
break;
case 240:
mTvSize = (float) (mTvSize / 1.5);
mRightSize = (float) (mRightSize / 1.5);
break;
case 320:
mTvSize = mTvSize / 2;
mRightSize = mRightSize / 2;
break;
case 480:
mTvSize = mTvSize / 3;
mRightSize = mRightSize / 3;
break;
case 640:
mTvSize = mTvSize / 4;
mRightSize = mRightSize / 4;
break;
default:
break;
}
}

/**
* 获取屏幕参数：宽，高
*
* @param context
*/
private DisplayMetrics getScreenParams(Context context) {
DisplayMetrics dm = context.getResources().getDisplayMetrics();
return dm;
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.img_left://左边按钮
if (mTopViewLeftListener != null) {
mTopViewLeftListener.onTopViewClick(v);
}
break;
case R.id.layout://右边按钮
if (mTopViewRightListener != null) {
mTopViewRightListener.onTopViewClick(v);
}
break;
}

}

/**
* 定义一个接口
*/
public interface TopViewListener {
void onTopViewClick(View v);
}

/**
* 自定义控件的点击事件
*/
public void setonLeftClick(TopViewListener topViewListener) {
mTopViewLeftListener = topViewListener;
}

public void setonRightClick(TopViewListener topViewListener) {
mTopViewRightListener = topViewListener;
}

}

attr.xml:定义控件属性

<?xml version="1.0" encoding="utf-8"?>
<resources>

<declare-styleable name="topView">
<attr name="TopViewColor" format="color" />
<attr name="TopViewSize" format="dimension" />
<attr name="TopViewText" format="string" />
<attr name="RightSize" format="dimension" />
<attr name="RightText" format="string" />
<attr name="LeftSrc" format="reference" />
<attr name="RightSrc" format="reference" />
<attr name="isRightShow" format="boolean" />
<attr name="isLeftShow" format="boolean" />
</declare-styleable>

</resources>

topview.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/bg_color" >

<ImageView
android:id="@+id/img_left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="15dp"
android:src="@drawable/daidide_fanhui" />

<TextView
android:id="@+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="title"
android:textColor="@color/white"
android:textSize="20sp" />

<LinearLayout
android:id="@+id/layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="15dp"
android:gravity="center"
android:orientation="vertical" >

<ImageView
android:id="@+id/img_right"
android:layout_width="30dp"
android:layout_height="30dp"
android:background="@drawable/daidideerj" />

<TextView
android:id="@+id/tv_right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1111"
android:textColor="#ffffff"
android:textSize="12sp" />
</LinearLayout>

</RelativeLayout>

引用控件：

activity_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:top="http://schemas.android.com/apk/res/com.example.topview"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<com.example.topview.TopView
android:id="@+id/topview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
top:LeftSrc="@drawable/daidide_fanhui"
top:RightSize="12sp"
top:RightSrc="@drawable/daidideerj"
top:RightText="联系客服"
top:TopViewColor="#ffffff"
top:TopViewSize="20sp"
top:isRightShow="false"
top:TopViewText="标题" />

</LinearLayout>

public class MainActivity extends Activity {
private TopView mTopView;
private Activity mActivity = MainActivity.this;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTopView = (TopView) findViewById(R.id.topview);
mTopView.setonLeftClick(new TopViewListener() {
@Override
public void onTopViewClick(View v) {
Toast.makeText(mActivity, "left", Toast.LENGTH_SHORT).show();
}
});
mTopView.setonRightClick(new TopViewListener() {
@Override
public void onTopViewClick(View v) {
Toast.makeText(mActivity, "right", Toast.LENGTH_SHORT).show();
}
});
}

}

记录一下。

代码中关于字体大小适配的方法不是很好，希望大神看到可以告知好的方法