Android编程实现自定义控件的方法示例

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="horizontal" >
  <ImageView
    android:id="@+id/imageView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"
    android:paddingBottom="5dip"
    android:paddingLeft="40dip"
    android:paddingTop="5dip"
    android:src="@drawable/right_icon" />
  <TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"
    android:layout_marginLeft="8dip"
    android:text="确定"
    android:textColor="#000000" />
</LinearLayout>

public class ImageBtn extends LinearLayout {
  private ImageView imageView;
  private TextView textView;
  public ImageBtn(Context context) {
    super(context);
    // TODO Auto-generated constructor stub
  }
  public ImageBtn(Context context, AttributeSet attrs) {
    super(context, attrs);
    // TODO Auto-generated constructor stub
    LayoutInflater inflater=(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    inflater.inflate(R.layout.imagebtn, this);
    imageView=(ImageView) findViewById(R.id.imageView1);
    textView=(TextView)findViewById(R.id.textView1);
  }
  /**
   * 设置图片资源
   */
  public void setImageResource(int resId) {
    imageView.setImageResource(resId);
  }
  /**
   * 设置显示的文字
   */
  public void setTextViewText(String text) {
    textView.setText(text);
  }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="horizontal" >
  <cn.com.karl.view.ImageBtn
    android:id="@+id/btn_right"
    android:layout_height="wrap_content"
    android:layout_width="wrap_content"
    android:background="@drawable/btn"
    />
  <cn.com.karl.view.ImageBtn
    android:id="@+id/btn_error"
    android:layout_marginLeft="5dp"
    android:layout_height="wrap_content"
    android:layout_width="wrap_content"
    android:background="@drawable/btn"
    />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
  <item android:state_focused="true" android:state_pressed="false" android:drawable="@drawable/btn_normal"></item>
  <item android:state_pressed="true" android:drawable="@drawable/btn_white"></item>
  <item android:state_checked="true" android:drawable="@drawable/btn_white"></item>
  <item android:state_focused="false" android:state_pressed="false" android:drawable="@drawable/btn_normal"></item>
</selector>

public class IdentifyButtonActivity extends Activity {
  private ImageBtn imageBtn1;
  private ImageBtn imageBtn2;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.identifybutton);
    imageBtn1=(ImageBtn) this.findViewById(R.id.btn_right);
    imageBtn2=(ImageBtn) this.findViewById(R.id.btn_error);
    imageBtn1.setTextViewText("确定");
    imageBtn2.setTextViewText("取消");
    imageBtn1.setImageResource(R.drawable.right_icon);
    imageBtn2.setImageResource(R.drawable.error_icon);
    imageBtn1.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "点击的正确按钮", 1).show();
      }
    });
    imageBtn2.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "点击的错误按钮", 1).show();
      }
    });
  }
}