1、Caused by: java.lang.ClassCastException: androidx.multidex.MultiDexApplication cannot be cast to com.example.firecontrol.MainApplication
解決方法，在manifest.xml中添加：
<application
android:name=".MainApplication"
2、Caused by: android.view.InflateException: Binary XML file line #13: Error inflating class com.google.android.material.tabs.TabLayout
Caused by: java.lang.reflect.InvocationTargetException
需要將activity當前的theme繼承Theme.AppCompat
<style name="AppBaseTheme" parent="Theme.AppCompat.Light" />
<style name="AppTheme" parent="AppBaseTheme">
<item name="android:textColor">@color/colorBlack</item>
<item name="android:windowBackground">@color/colorWhite</item>
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
3、Java異常：java.lang.InstantiationException
出現這個異常可能有很多原因，我的原因是把class用abstact修飾了
4、java.lang.BootstrapMethodError: Exception from call site #1 bootstrap method
android {
······
compileOptions{
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
5、Android studio 3.5格式化xml層級錯亂問題
Settings > Editor > Code Style > XML > Set from… > Predefined Style > Android
6、com.google.gson.JsonSyntaxException: java.lang.NumberFormatException: For input string
問題出現的原因：
javaBean中有一個變量是Integer
json對象是String
7、Static interface methods are only supported starting with Android N (--min-api 24)
在build.gradle文件Android下添加compileOptions
android {
······
compileOptions{
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
8、Couldn't find meta-data for provider with authority
問題出現原因：缺少下載權限
<!-- 7.0下載權限 -->
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="自定義"
android:exported="false"
android:grantUriPermissions="true">
<!-- 元數據 -->
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_path" />
</provider>
<service android:name=".download.DownloadService" />
9、PackageInstaller: Requesting uid 10215 needs to declare permission android.permission.REQUEST_INSTALL_PACKAGES
解決辦法：mainfest中添加適配權限
<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" /> <!-- 適配8.0 -->
10、java.lang.RuntimeException: Failure delivering result ResultInfo{who=@android:requestPermissions:, request=65813, result=-1, data=Intent { act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} to activity {com.cloudXF.app/com.cloudXF.app.index.MainActivity}: java.lang.RuntimeException: Cannot execute method locationTask because it is non-void method and/or has input parameters.
出現場景：Android 6.0 以上使用EasyPermissions動態申請權限
//AfterPermissionGranted只能與不帶參數的方法一起使用,否則會崩潰@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
// Forward results to EasyPermissions
EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
}
@Override
public void onPermissionsGranted(int requestCode, @NonNull List<String> perms) {
}
@Override
public void onPermissionsDenied(int requestCode, @NonNull List<String> perms) {
}
@AfterPermissionGranted(Constant.REQUEST_CODE.LOCATION)
public void locationTask() {//我的錯誤原因：locationTask方法攜帶參數
String[] perms = {Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION};
if (EasyPermissions.hasPermissions(getActivity(), perms)) {
locate();
} else {
EasyPermissions.requestPermissions(this, getString(R.string.location_permission), Constant.REQUEST_CODE.LOCATION, perms);
}
}
11、BuildConfig.DEBUG一直返回false
我的錯誤原因：自動導入的BuildConfig不是應用程序中，而是導入的其他庫的BuildConfig
12、RecyclerView報錯
（1）java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid item position 4(offset:4).state:10 androidx.recyclerview.widget.RecyclerView{e9d59c4 VFED..... ......I. 0,108-174,858 #7f080179 app:id/rv_floor}, adapter:com.cloudXF.app.business.home.adapter.FloorAdapter@bf120ad, layout:androidx.recyclerview.widget.LinearLayoutManager@6dcfe2, context:com.cloudXF.app.index.MainActivity@ee48f73
解決方法：重寫LinearLayoutManager
public class CommonLayoutManager extends LinearLayoutManager { public CommonLayoutManager(Context context) { super(context); } public CommonLayoutManager(Context context, int orientation, boolean reverseLayout) { super(context, orientation, reverseLayout); } public CommonLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); } @Override public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) { try { super.onLayoutChildren(recycler, state); } catch (IndexOutOfBoundsException e) { e.printStackTrace(); } } }
13、Canvas：Invalid Region.Op - only INTERSECT and DIFFERENCE are allowed
報錯代碼：canvas.clipRect(mClipBounds, Region.Op.UNION);
解決方案：
if (Build.VERSION.SDK_INT >= 26) {
canvas.clipRect(mClipBounds);
} else {
canvas.clipRect(mClipBounds, Region.Op.UNION);
}
14、Error:Could not resolve all dependencies for configuration ':classpath'
原因分析：Android Studio 3.0 中 Google 將自己的依賴包放在了 google ( )，我的項目沒有添加google()倉庫
解決方案：
repositories {
google() //Google倉庫
jcenter() //JCenter倉庫
}
15、Your project path contains non-ASCII characters.
原因：項目路經包含中文
16、andorid布局文件里面的app:srcCompat設置的圖片不顯示
（1）Activity 繼承AppcompatActivity ，使用 ImageView的 app:srcCompat 是沒有問題的
（2）Activity 不是繼承AppcompatActivity，用AppCompatImageView 代替 ImageView
17、集成百度地圖時報錯Caused by: groovy.lang.MissingPropertyException: Could not get unknown property 'jniLibs' for source set 'main' of type org.gradle.api.internal.tasks.DefaultSourceSet.
原因：將sourceSets放在了build.gradle的最外層
sourceSets {
main {
jniLibs.srcDir 'libs'
jni.srcDirs = [] //disable automatic ndk-build
}
}
修改為：放在android{}中
android {
……
sourceSets {
main {
jniLibs.srcDir 'libs'
jni.srcDirs = [] //disable automatic ndk-build
}
}
}