很多时候android常用的控件不能满足我们的需求,那么我们就需要自定义一个控件了。今天做了一个自定义控件的实例,来分享下。
首先定义一个layout实现按钮内部布局:
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<? xml version = "1.0" encoding = "utf-8" ?> |
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< LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" |
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android:layout_width = "fill_parent" |
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android:layout_height = "fill_parent" |
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android:orientation = "horizontal" > |
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android:id = "@+id/imageView1" |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:layout_gravity = "center_vertical" |
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android:paddingBottom = "5dip" |
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android:paddingLeft = "40dip" |
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android:paddingTop = "5dip" |
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android:src = "@drawable/right_icon" /> |
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android:id = "@+id/textView1" |
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android:layout_width = "wrap_content" |
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android:layout_height = "wrap_content" |
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android:layout_gravity = "center_vertical" |
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android:layout_marginLeft = "8dip" |
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android:textColor = "#000000" /> |
接下来写一个类继承LinearLayout,导入刚刚的布局,并且设置需要的方法,从而使的能在代码中控制这个自定义控件内容的显示。
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public class ImageBtn extends LinearLayout { |
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private ImageView imageView; |
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private TextView textView; |
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public ImageBtn(Context context) { |
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public ImageBtn(Context context, AttributeSet attrs) { |
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super (context, attrs); |
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LayoutInflater inflater=(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); |
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inflater.inflate(R.layout.imagebtn, this ); |
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imageView=(ImageView) findViewById(R.id.imageView1); |
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textView=(TextView)findViewById(R.id.textView1); |
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public void setImageResource( int resId) { |
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imageView.setImageResource(resId); |
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public void setTextViewText(String text) { |
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textView.setText(text); |
在需要使用这个自定义控件的layout中加入这控件,只需要在xml中加入即可。
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<? xml version = "1.0" encoding = "utf-8" ?> |
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< LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" |
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android:layout_width = "fill_parent" |
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android:layout_height = "fill_parent" |
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android:orientation = "horizontal" > |
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< cn.com.karl.view.ImageBtn |
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android:id = "@+id/btn_right" |
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android:layout_height = "wrap_content" |
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android:layout_width = "wrap_content" |
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android:background = "@drawable/btn" |
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< cn.com.karl.view.ImageBtn |
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android:id = "@+id/btn_error" |
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android:layout_marginLeft = "5dp" |
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android:layout_height = "wrap_content" |
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android:layout_width = "wrap_content" |
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android:background = "@drawable/btn" |
这里用到了背景图片 在drawable/btn.xml
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<? xml version = "1.0" encoding = "utf-8" ?> |
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< selector xmlns:android = "http://schemas.android.com/apk/res/android" > |
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< item android:state_focused = "true" android:state_pressed = "false" android:drawable = "@drawable/btn_normal" ></ item > |
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< item android:state_pressed = "true" android:drawable = "@drawable/btn_white" ></ item > |
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< item android:state_checked = "true" android:drawable = "@drawable/btn_white" ></ item > |
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< item android:state_focused = "false" android:state_pressed = "false" android:drawable = "@drawable/btn_normal" ></ item > |
最后在activity中设置该控件,和其他控件差不多:
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public class IdentifyButtonActivity extends Activity { |
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private ImageBtn imageBtn1; |
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private ImageBtn imageBtn2; |
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protected void onCreate(Bundle savedInstanceState) { |
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super .onCreate(savedInstanceState); |
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setContentView(R.layout.identifybutton); |
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imageBtn1=(ImageBtn) this .findViewById(R.id.btn_right); |
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imageBtn2=(ImageBtn) this .findViewById(R.id.btn_error); |
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imageBtn1.setTextViewText( "确定" ); |
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imageBtn2.setTextViewText( "取消" ); |
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imageBtn1.setImageResource(R.drawable.right_icon); |
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imageBtn2.setImageResource(R.drawable.error_icon); |
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imageBtn1.setOnClickListener( new View.OnClickListener() { |
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public void onClick(View v) { |
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Toast.makeText(getApplicationContext(), "点击的正确按钮" , 1 ).show(); |
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imageBtn2.setOnClickListener( new View.OnClickListener() { |
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public void onClick(View v) { |
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Toast.makeText(getApplicationContext(), "点击的错误按钮" , 1 ).show(); |
最后看看我们自定义控件的效果吧!
点击后还有按下按钮的效果。