Android开发步骤及注意事项

来源：互联网发布：蔡珍妮的淘宝店编辑：程序博客网时间：2024/04/28 09:18

1，在Activity中实现Activity的声明周期方法。

onCreate()

onDestroy()

2，继承Application实现自定义生命周期管理

import java.util.Stack;import android.app.Activity;import android.app.Application;public class MyApplication extends Application{private static Stack<Activity> activityStack;    private static MyApplication singleton;    @Override    public void onCreate()    {        super.onCreate();        singleton=this;    }    // Returns the application instance    public static MyApplication getInstance() {        return singleton;    }    /**     * add Activity 添加Activity到栈     */    public void addActivity(Activity activity){        if(activityStack ==null){            activityStack =new Stack<Activity>();        }        activityStack.add(activity);    }    /**     * get current Activity 获取当前Activity（栈中最后一个压入的）     */    public Activity currentActivity() {        Activity activity = activityStack.lastElement();        return activity;    }    /**     * 结束当前Activity（栈中最后一个压入的）     */    public void finishActivity() {        Activity activity = activityStack.lastElement();        finishActivity(activity);    }    /**     * 结束指定的Activity     */    public void finishActivity(Activity activity) {        if (activity != null) {            activityStack.remove(activity);            activity.finish();            activity = null;        }    }    /**     * 结束指定类名的Activity     */    public void finishActivity(Class<?> cls) {        for (Activity activity : activityStack) {            if (activity.getClass().equals(cls)) {                finishActivity(activity);            }        }    }    /**     * 结束所有Activity     */    public void finishAllActivity() {        for (int i = 0, size = activityStack.size(); i < size; i++) {            if (null != activityStack.get(i)) {                activityStack.get(i).finish();            }        }        activityStack.clear();    }    /**     * 退出应用程序     */    public void AppExit() {        try {            finishAllActivity();        } catch (Exception e) {        }    }}

修改AndroidMenifest.xml应用配置文件。

 <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"       <span style="color:#FF0000;"><strong> android:name="com.example.zxingdemo.MyApplication"</strong></span>        android:theme="@android:style/Theme.NoTitleBar" >

3，代码中进行生命周期控制

</pre><pre name="code" class="java">public class MainActivity2 extends Activity {TextView textView6, textView7, textView8, textView9;Button button;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);<span style="color:#FF6666;"><strong>MyApplication.getInstance().addActivity(this);</strong></span>setContentView(R.layout.permanent);textView6 = (TextView) findViewById(R.id.textView6);textView7 = (TextView) findViewById(R.id.textView7);textView8 = (TextView) findViewById(R.id.textView8);textView9 = (TextView) findViewById(R.id.textView9);Bundle bundle = this.getIntent().getExtras();button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(MainActivity2.this,MainActivity.class);startActivity(intent);}});}@Overrideprotected void onDestroy() {super.onDestroy();<span style="color:#FF0000;"><strong>MyApplication.getInstance().finishActivity(this);</strong></span>}}

4，Activity中所有声明的控件必须实例化。

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