Android自定義View(三)

完整源碼如下：

atts.xml文件上面有，就不貼了
MainActivity.java

package com.example.myview;

import com.example.myview.TopBar.TopBarClickListener;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		TopBar topBar = (TopBar) findViewById(R.id.topbar);
		topBar.setTopBarClickListener(new TopBarClickListener() {

			@Override
			public void rightClick() {
				// TODO 自動生成的方法存根
				Toast.makeText(MainActivity.this, "獲取更多", 0).show();
			}

			@Override
			public void leftClick() {
				// TODO 自動生成的方法存根

				Toast.makeText(MainActivity.this, "點擊取消", 0).show();
			}
		});
		//topBar.setLeftButtonVisible(false);通過方法可以設置更多自定義屬性
	}
		
}

package com.example.myview;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

/**
 * Created by Administrator on 2015/12/28.
 */
public class TopBar extends RelativeLayout {

	private Button leftButton, rightButton;
	private TextView tvTitle;

	private int leftTextColor;
	private Drawable leftBackground;
	private String leftText;

	private int rightTextColor;
	private Drawable rightBackground;
	private String rightText;

	private float titleTextSize;
	private int titleTextColor;
	private String MyTitle;

	private LayoutParams leftParams, rightParams, titleParams;

	TopBarClickListener topBarClickListener;

	public TopBar(final Context context, AttributeSet attrs) {
		super(context, attrs);

		TypedArray ta = context.obtainStyledAttributes(attrs,
				R.styleable.Topbar);
		leftTextColor = ta.getColor(R.styleable.Topbar_leftTextColor, 0);
		leftBackground = ta.getDrawable(R.styleable.Topbar_leftBackground);
		leftText = ta.getString(R.styleable.Topbar_leftText);

		rightTextColor = ta.getColor(R.styleable.Topbar_rightTextColor, 0);
		rightBackground = ta.getDrawable(R.styleable.Topbar_rightBackground);
		rightText = ta.getString(R.styleable.Topbar_rightText);

		titleTextSize = ta.getDimension(R.styleable.Topbar_titleTextSize, 0);
		titleTextColor = ta.getColor(R.styleable.Topbar_titleTextColor, 0);
		MyTitle = ta.getString(R.styleable.Topbar_MyTitle);

		ta.recycle();

		leftButton = new Button(context);
		rightButton = new Button(context);
		tvTitle = new TextView(context);

		leftButton.setTextColor(leftTextColor);
		leftButton.setBackground(leftBackground);
		leftButton.setText(leftText);

		rightButton.setTextColor(rightTextColor);
		rightButton.setBackground(rightBackground);
		rightButton.setText(rightText);

		tvTitle.setText(MyTitle);
		tvTitle.setTextColor(titleTextColor);
		tvTitle.setTextSize(titleTextSize);
		tvTitle.setGravity(Gravity.CENTER);

		setBackgroundColor(0xFFF59563);

		leftParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
				ViewGroup.LayoutParams.WRAP_CONTENT);
		leftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT, TRUE);
		addView(leftButton, leftParams);

		rightParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
				ViewGroup.LayoutParams.WRAP_CONTENT);
		rightParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, TRUE);
		addView(rightButton, rightParams);

		titleParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
				ViewGroup.LayoutParams.MATCH_PARENT);
		titleParams.addRule(RelativeLayout.CENTER_IN_PARENT, TRUE);
		addView(tvTitle, titleParams);

		leftButton.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				
				// Toast.makeText(context, "左邊bt", 0).show();
				topBarClickListener.leftClick();
			}
		});
		rightButton.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
		
				// Toast.makeText(context, "右邊bt", 0).show();
				topBarClickListener.rightClick();
			}
		});

	}

	//使用了接口的回調機制
	public interface TopBarClickListener {
		public void leftClick();

		public void rightClick();
	}

	//暴露一個方法給其他地方調用
	public void setTopBarClickListener(TopBarClickListener listener) {
		this.topBarClickListener = listener;

	}
	
	//當然可以設置更多控件的屬性      這裡是以方法的形式設置控件的屬性
     public void setLeftButtonVisible(boolean b) {
		if (b) {
			leftButton.setVisibility(View.VISIBLE);
		}else {
			leftButton.setVisibility(View.GONE);
		}
	}
}