照著第一行代碼實例敲的，在第8章使用通知的實例代碼中卡住了。具體代碼
MainActivity
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button sendNotice = (Button) findViewById(R.id.send_notice);
sendNotice.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.send_notice:
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
builder.setContentTitle("BasicNotifications Sample");
builder.setContentText("Time to learn about notifications!");
builder.setSubText("Tap to view documentation about notifications.");
builder.setAutoCancel(true);
//.setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher_round));
manager.notify(1, builder.build());
break;
default:
break;
}
}
}Gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
buildToolsVersion "26.0.2"
defaultConfig {
applicationId "com.example.administrator.mediatest"
minSdkVersion 21
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:26.+'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
}
報錯log
01-09 15:10:58.225 27760-27760/com.example.administrator.mediatest E/Typeface: SANS_LOC file not found.
01-09 15:10:58.695 27760-27760/com.example.administrator.mediatest W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
01-09 15:10:58.765 27760-27760/com.example.administrator.mediatest E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.administrator.mediatest, PID: 27760
java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v7/appcompat/R$drawable;
at android.support.v7.widget.AppCompatDrawableManager.<clinit>(AppCompatDrawableManager.java:110)
at android.support.v7.widget.AppCompatDrawableManager.get(AppCompatDrawableManager.java:84)
at android.support.v7.widget.TintTypedArray.getDrawableIfKnown(TintTypedArray.java:81)
at android.support.v7.app.AppCompatDelegateImplBase.<init>(AppCompatDelegateImplBase.java:129)
at android.support.v7.app.AppCompatDelegateImplV9.<init>(AppCompatDelegateImplV9.java:152)
at android.support.v7.app.AppCompatDelegateImplV11.<init>(AppCompatDelegateImplV11.java:29)
at android.support.v7.app.AppCompatDelegateImplV14.<init>(AppCompatDelegateImplV14.java:53)
at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:204)
at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:184)
at android.support.v7.app.AppCompatActivity.getDelegate(AppCompatActivity.java:518)
at android.support.v7.app.AppCompatActivity.onCreate(AppCompatActivity.java:70)
at com.example.administrator.mediatest.MainActivity.onCreate(MainActivity.java:18)
at android.app.Activity.performCreate(Activity.java:5958)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2474)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1359)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:155)
at android.app.ActivityThread.main(ActivityThread.java:5702)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824)
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v7.appcompat.R$drawable" on path: DexPathList[[zip file "/data/app/com.example.administrator.mediatest-2/base.apk", zip file "/data/app/com.example.administrator.mediatest-2/split_lib_dependencies_apk.apk", zip file "/data/app/com.example.administrator.mediatest-2/split_lib_slice_0_apk.apk", zip file "/data/app/com.example.administrator.mediatest-2/split_lib_slice_1_apk.apk", zip file "/data/app/com.example.administrator.mediatest-2/split_lib_slice_3_apk.apk", zip file "/data/app/com.example.administrator.mediatest-2/split_lib_slice_4_apk.apk", zip file "/data/app/com.example.administrator.mediatest-2/split_lib_slice_5_apk.apk", zip file "/data/app/com.example.administrator.mediatest-2/split_lib_slice_6_apk.apk", zip file "/data/app/com.example.administrator.mediatest-2/split_lib_slice_7_apk.apk", zip file "/data/app/com.example.administrator.mediatest-2/split_lib_slice_8_apk.apk", zip file "/data/app/com.example.administrator.mediatest-2/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.support.v7.widget.AppCompatDrawableManager.<clinit>(AppCompatDrawableManager.java:110)?
at android.support.v7.widget.AppCompatDrawableManager.get(AppCompatDrawableManager.java:84)?
at android.support.v7.widget.TintTypedArray.getDrawableIfKnown(TintTypedArray.java:81)?
at android.support.v7.app.AppCompatDelegateImplBase.<init>(AppCompatDelegateImplBase.java:129)?
at android.support.v7.app.AppCompatDelegateImplV9.<init>(AppCompatDelegateImplV9.java:152)?
at android.support.v7.app.AppCompatDelegateImplV11.<init>(AppCompatDelegateImplV11.java:29)?
at android.support.v7.app.AppCompatDelegateImplV14.<init>(AppCompatDelegateImplV14.java:53)?
at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:204)?
at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:184)?
at android.support.v7.app.AppCompatActivity.getDelegate(AppCompatActivity.java:518)?
at android.support.v7.app.AppCompatActivity.onCreate(AppCompatActivity.java:70)?
at com.example.administrator.mediatest.MainActivity.onCreate(MainActivity.java:18)?
at android.app.Activity.performCreate(Activity.java:5958)?
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129)?
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)?
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2474)?
at android.app.ActivityThread.access$800(ActivityThread.java:144)?
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1359)?
at android.os.Handler.dispatchMessage(Handler.java:102)?
at android.os.Looper.loop(Looper.java:155)?
at android.app.ActivityThread.main(ActivityThread.java:5702)?
at java.lang.reflect.Method.invoke(Native Method)?
at java.lang.reflect.Method.invoke(Method.java:372)?
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)?
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824)?
Suppressed: java.lang.ClassNotFoundException: android.support.v7.appcompat.R$drawable
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 26 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available關(guān)鍵在這幾句,希望得到大家指點
java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v7/appcompat/R$drawable;
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v7.appcompat.R$drawable" on path:
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
我也遇到同樣的問題，樓主怎么解決的
請從1到5依次嘗試：
File | Settings | Build, Execution, Deployment | Instant Run中關(guān)閉Instant Run，重新安裝APK。Build->Clean Project再Build->Build Project。appcompat-v7，如compile 'com.android.support:appcompat-v7:25.+'
希望能幫助到你
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