安卓问题汇总

1、写了简单的界面，报错
Error:Error converting bytecode to dex:
Cause: Dex cannot parse version 52 byte code.
This is caused by library dependencies that have been compiled using Java 8 or above.
If you are using the ‘java’ gradle plugin in a library submodule add
targetCompatibility = ‘1.7’
sourceCompatibility = ‘1.7’
to that submodule’s build.gradle file.
app的build.gradle在中添加

compileOptions.with {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }

然后还是报了错，
Error:Jack is required to support java 8 language features. Either enable Jack or remove sourceCompatibility JavaVersion.VERSION_1_8.
解决方案：在app的build.gradle里加三行

defaultConfig {
        applicationId "com.xxx"
        minSdkVersion 19
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
        jackOptions {               //加
            enabled true            //加
        }                           //加
}

参考：http://blog.csdn.net/fullstackdeveloper/article/details/52701707

2、然后遇到问题是闪退，显示xx已经停止工作，然后看catlog是很多错误
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo {com.android/activity.MainTabActivity}:
查到说是AndroidManifest.xml 配置 activity 时路径搞错了。
果然进入AndroidManifest.xml，

<activity android:name="com.myapp.test.MainActivity" >

发现只写了MainActivity，没有前面一长串，还报错了，当时没看出来，找了半天。
参看http://jakend.iteye.com/blog/1014479

3、然而还是有问题，

Could not find class ‘android.graphics.drawable.Ripple
Drawable’, referenced from method android.support.
v7.widget.AppCompatImageHelper.hasOverlappingRendering

这查了半天，最后发现是版本问题，
在app的build.gradle中查看最低版本和目标版本，结果发现模拟器用的19，程序不行，但真机已经可以，应该是版本的问题。

 defaultConfig {
        applicationId "com.example.a10024.myapplication"
        minSdkVersion 15
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        jackOptions {
            enabled true
        }

参看http://blog.csdn.net/jiawei6212130/article/details/52302432#reply

再就是标题栏自己消失是因为继承了Activity，改成AppCompatActivity就好了。

困！但终于解决了！

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