Android开发学习笔记-splash画面的显示

贴代码：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.frank.mobilesafe"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="21" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >

        </activity>
        <activity
            android:name=".SplashActivity"
          android:theme="@android:style/Theme.NoTitleBar"
            android:label="@string/title_activity_splash" >
             <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

处理类：

package com.frank.mobilesafe;

import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Bundle;
import android.view.Window;
import android.widget.TextView;

public class SplashActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);//去掉标题栏
        setContentView(R.layout.activity_splash);
        TextView tv_version = (TextView) findViewById(R.id.tv_version);
        tv_version.setText(getVersion());
    }

    protected String getVersion() {
        String versionStr = "";
        PackageManager packManger = getPackageManager();
        try {
            PackageInfo info = packManger.getPackageInfo(getPackageName(), 0);
            versionStr = info.versionName;//获得版本号
        } catch (NameNotFoundException e) {
            // TODO Auto-generated catch block
            versionStr = "";
            e.printStackTrace();
        }
        return versionStr;

    }
}

配置文件：

 <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >

        </activity>
        <activity
            android:name=".SplashActivity"
          android:theme="@android:style/Theme.NoTitleBar"
            android:label="@string/title_activity_splash" >
             <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

总结：

1、在设置splash画面显示的时候，最初以为是使用ImageView，最后了解才知道是使用的android:background="@drawable/luncher_bg"

2、新技术主要就是使用packmanger类读入关于版本的一些信息了

3、在去除标题的时候在配置文件中加入 android:theme="@android:style/Theme.NoTitleBar"之后程序在启动的时候就报错，最后看logcat顺着流程走才发现原来

Activity默认继承的是ActionBarActivity类，将其改为Activity则程序正常启动