设计一个通用的BaseActivity

如果是只有一个Activity的App就没有必要写BaseActivity，但一旦大于一个我还是建议写一个BaseActivity，准没错。

每个Activity通常都是绑定视图，绑定控件，监听控件，获取Bundle，跳转Activity还有一些很有些烦人的小功能如：Toast，findViewById，我们都可以封装一层简化他们的使用

BaseActivity的代码如下：

public abstract class BaseActivity extends Activity implements View.OnClickListener { /** 是否沉浸状态栏 **/ 
private boolean isSetStatusBar = true; 
/** 是否允许全屏 **/
 private boolean mAllowFullScreen = true; 
/** 是否禁止旋转屏幕 **/ 
private boolean isAllowScreenRoate = false; 
/** 当前Activity渲染的视图View **/ 
private View mContextView = null;
 /*
* 日志输出标志 
**/
 protected final String TAG = this.getClass().getSimpleName();
 /*
* View点击 
**/ 
public abstract void widgetClick(View v);
 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); 
Log.d(TAG, "BaseActivity-->onCreate()");
 Bundle bundle = getIntent().getExtras(); 
initParms(bundle);
 View mView = bindView(); 
if (null == mView) { mContextView = LayoutInflater.from(this) .inflate(bindLayout(), null); 
} else mContextView = mView;
 if (mAllowFullScreen) { requestWindowFeature(Window.FEATURE_NO_TITLE); 
} if (isSetStatusBar) { steepStatusBar(); } setContentView(mContextView); 
if (!isAllowScreenRoate) { setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); 
} initView(mContextView); 
setListener(); doBusiness(this); 
} 
/** 
* [沉浸状态栏] 
*/
 private void steepStatusBar() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { // 透明状态栏 getWindow().addFlags( WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
 // 透明导航栏
 getWindow().addFlags( WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION); } } /** 
* [初始化参数] * 
* @param parms 
*/ 
public abstract void initParms(Bundle parms); 
/** 
* [绑定视图] * 
* @return 
*/
 public abstract View bindView(); /** * [绑定布局] * * @return */ public abstract int bindLayout();
 /** 
* [初始化控件] *
 * @param view
 */ 
public abstract void initView(final View view); 
/** 
* [绑定控件] *
 * @param resId *
 * @return 
*/ 
protected  T $(int resId) { return (T) super.findViewById(resId); 
}
 /**
 * [设置监听] 
*/ 
public abstract void setListener(); @Override public void onClick(View v) { widgetClick(v); 
} 
/**
 * [业务操作] 
*
 * @param mContext */ 
public abstract void doBusiness(Context mContext); 
/**
 * [页面跳转]
 * * @param clz 
*/ 
public void startActivity(Class clz) { startActivity(new Intent(BaseActivity.this,clz)); 
} 
/** 
* [携带数据的页面跳转]
 * * @param clz * @param bundle 
*/ 
public void startActivity(Class clz, Bundle bundle) 
{ Intent intent = new Intent(); intent.setClass(this, clz);
 if (bundle != null) {
 intent.putExtras(bundle); 

} startActivity(intent); 
} 
/** * [含有Bundle通过Class打开编辑界面] 
* * @param cls 
* @param bundle 
* @param requestCode 
*/ 
public void startActivityForResult(Class cls, Bundle bundle, int requestCode)
 { Intent intent = new Intent(); 
intent.setClass(this, cls);
 if (bundle != null)
 { intent.putExtras(bundle); 
}
 startActivityForResult(intent, requestCode); 
} 
@Override 
protected void onRestart()
 { super.onRestart(); Log.d(TAG, "onRestart()");} 
@Override 
protected void onStart() 
{ super.onStart(); Log.d(TAG, "onStart()"); } 
@Override 
protected void onResume() 
{ super.onResume(); 
Log.d(TAG, "onResume()"); 
} 
@Override 
protected void onPause()
 { super.onPause(); Log.d(TAG, "onPause()"); } @Override 
protected void onStop() 
{ super.onStop(); Log.d(TAG, "onStop()"); } @Override 
protected void onDestroy() 
{
 super.onDestroy(); 
Log.d(TAG, "onDestroy()"); 
} 
/** 
* [简化Toast] 
* @param msg 
*/ 
protected void showToast(String msg){ Toast.makeText(this,msg,Toast.LENGTH_SHORT).show(); 
} 
/**
 * [是否允许屏幕旋转] * 
* @param isAllowScreenRoate 
*/ 
public void setScreenRoate(boolean isAllowScreenRoate) 
{ this.isAllowScreenRoate = isAllowScreenRoate; 
} } 
/**
 * [是否允许全屏] * 
* @param allowFullScreen */ 
public void setAllowFullScreen(boolean allowFullScreen)
 { this.mAllowFullScreen = allowFullScreen; } 
/** 
* [是否设置沉浸状态栏] * 
* @param isSetStatusBar 
*/ 
public void setSteepStatusBar(boolean isSetStatusBar) 
{ this.isSetStatusBar = isSetStatusBar; } 
/** 
* [是否允许屏幕旋转] *
 * @param isAllowScreenRoate
 */
 public void setScreenRoate(boolean isAllowScreenRoate)
 { this.isAllowScreenRoate = isAllowScreenRoate; 
} }
[是否设置沉浸状态栏] 
* * @param isSetStatusBar 
*/ public void setSteepStatusBar(boolean isSetStatusBar) 
{ this.isSetStatusBar = isSetStatusBar; 
} 
/**
 * [是否允许屏幕旋转] 
* *@param isAllowScreenRoate */
 public void setScreenRoate(boolean isAllowScreenRoate) { 
this.isAllowScreenRoate = isAllowScreenRoate; } 
}

继承自BaseActivity的Activity使用如下：

---

public class MainActivity extends BaseActivity { 
private Button btn1;

 @Override public void widgetClick(View v) {
 switch (v.getId()){
 case R.id.button: 
//用简化了的toast和startActivity 
showToast("toast"); 
startActivity(Main2Activity.class);
 break;} 
} 
@Override 
public void initParms(Bundle parms)
 { //解析bundle内容或者设置是否旋转，沉浸，全屏 }
 @Override public View bindView() { return null; } @Override public int bindLayout(){ 
return R.layout.activity_main; }

 @Override 
public void initView(View view) { 
btn1=$(R.id.button);
 } @Override
 public void setListener() { btn1.setOnClickListener(this); }

 @Override 
public void doBusiness(Context mContext) { } }

可以看到还是很多重复代码的，所以说搞一个BaseActivity是多么有必要，而且Fragment也要搞一个基类，方法也类似，这样可以大大减少重复代码，而且管理起来还比较容易，保持了样式的一致，如果想个性化也预留了相应的方法。