android SDK开发 -- TitleBar封装(二)

android SDK开发 -- TitleBar封装 (一) 点击打开链接

这一篇讲述一下TitleBar怎么增加交互

BaseActivity 中的逻辑实现

private ViewSwitcher[] titleSwitcher;

	/**
	 * 初始化View
	 */
	protected void findViewById() {
		titleSwitcher = new ViewSwitcher[3];
		titleSwitcher[0] = (ViewSwitcher) findViewById(R.id.app_title_left_switcher);
		titleSwitcher[1] = (ViewSwitcher) findViewById(R.id.app_title_middle_switcher);
		titleSwitcher[2] = (ViewSwitcher) findViewById(R.id.app_title_right_switcher);
	}

	protected void setTitle(TitleRes leftTitle, TitleRes middleTitle, TitleRes rightTitle) {
		TitleRes[] reses = new TitleRes[] { leftTitle, middleTitle, rightTitle };
		for (int i = 0; i < reses.length; i++) {
			TitleRes res = reses[i];
			ViewSwitcher switcher = titleSwitcher[i];
			if (res == null) {
				switcher.setVisibility(View.INVISIBLE);
			} else {
				switcher.setVisibility(View.VISIBLE);
				// 触发单击事件的View
				View clickView = null;
				// 文字
				if (res.getType() == 0) {
					switcher.setDisplayedChild(0);// 显示TextView
					//
					Object resource = res.getResource();
				String title = resource instanceof Integer ? getResources().getString((Integer) resource) : String.valueOf(resource);
					((TextView) switcher.getChildAt(0)).setText(title);
					clickView = switcher.getChildAt(0);
				} else {
					switcher.setDisplayedChild(1);// 显示ImageView
					//
					int imageResource = (Integer) res.getResource();
					((ImageView) switcher.getChildAt(1)).setImageResource(imageResource);
					clickView = switcher.getChildAt(1);
				}
				// 设置title的单击事件
				clickView.setOnClickListener(res.getClickListener());
			}
		}
	}

自雷TitleSampleActivity 调用如下

@Override
	protected void findViewById() {
		setContentView(R.layout.title_demo);
		super.findViewById();

		// setTitle("返回主页", "这是一个Title", "下一个界面");
		TitleRes left = new TitleRes("left", new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				Toast.makeText(TitleDemoActivity.this, "click left", Toast.LENGTH_SHORT).show();
				//showToast("click left");
			}
		});
		TitleRes middle = new TitleRes("middle", new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				Toast.makeText(TitleDemoActivity.this, "click middle", Toast.LENGTH_SHORT).show();
				//showToast("click middle");
			}
		});
		TitleRes right = new TitleRes("right", new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				Toast.makeText(TitleDemoActivity.this, "click right", Toast.LENGTH_SHORT).show();
				//showToast("click right");
			}
		});
		//
		setTitle(left, middle, right);
	}

这个时候title三个控件都具备了交互的能力


Toast.makeText(TitleDemoActivity.this,
"click right",Toast.LENGTH_SHORT).show();
程序中会频繁的用到 context Toast等对象
采用Class.this的方式在代码移植、维护、重构等方面很不友好
另外频繁调用Toast每次都那么写的话 麻烦死


所以BaseActivity中新增俩方法

作用于暂且定义为protected 以后估计还得改



protected Context getContext() {
return
this;
}

protected
void showToast(String message) {
Toast.makeText(getContext(), message,Toast.LENGTH_SHORT).show();
}

这个时候子类调用父类的代码如下



TitleRes left =newTitleRes("left",newView.OnClickListener() {
@Override
public
void onClick(View v) {
showToast("click left");//
}
});
。。。。中、右略
//
setTitle(left,middle, right);