class LoginActivity : BaseActivity() { private val accountList = mutableMapOf<String, String>() override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_login) supportActionBar?.hide() //记住密码功能 val prefs = getPreferences(Context.MODE_PRIVATE) val isRemember = prefs.getBoolean("remember_password", false) if (isRemember) { val account = prefs.getString("account", "") val password = prefs.getString("password", "") accountEdit.setText(account) passwordEdit.setText(password) rememberPass.isChecked = true }

怎么修改这段代码强制下线后跳转到loginActivityopen class BaseActivity : AppCompatActivity() { private val receiver = object : BroadcastReceiver() { override fun onReceive(context: Context?, intent: Intent?) { if (intent?.action == "com.example.FORCE_OFFLINE") { // 强制下线 finish() } } } override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) val filter = IntentFilter() filter.addAction("com.example.FORCE_OFFLINE") registerReceiver(receiver, filter) } override fun onDestroy() { super.onDestroy() unregisterReceiver(receiver) }}

override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) val filter = IntentFilter() filter.addAction("com.example.FORCE_OFFLINE") registerReceiver(receiver, filter...

在强制下线时加入提示代码 logout确定下线open class BaseActivity : AppCompatActivity() { private val receiver = object : BroadcastReceiver() { override fun onReceive(context: Context?, intent: Intent?) { if (intent?.action == "com.example.FORCE_OFFLINE") { // 强制下线 finish() val loginIntent = Intent(context, MainActivity::class.java) loginIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK startActivity(loginIntent) } } } override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) val filter = IntentFilter() filter.addAction("com.example.FORCE_OFFLINE") registerReceiver(receiver, filter) } override fun onDestroy() { super.onDestroy() unregisterReceiver(receiver) } }

private fun logout() { // 清除用户登录信息 // 关闭与服务器的连接 // ... // 执行下线操作 finish() val loginIntent = Intent(this, MainActivity::class.java) loginIntent.flags = Intent.FLAG_...

在强制下线时加入提示代码确定下线open class BaseActivity : AppCompatActivity() { private val receiver = object : BroadcastReceiver() { override fun onReceive(context: Context?, intent: Intent?) { if (intent?.action == "com.example.FORCE_OFFLINE") { // 强制下线 finish() val loginIntent = Intent(context, MainActivity::class.java) loginIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK startActivity(loginIntent) } } } override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) val filter = IntentFilter() filter.addAction("com.example.FORCE_OFFLINE") registerReceiver(receiver, filter) } override fun onDestroy() { super.onDestroy() unregisterReceiver(receiver) } }

val loginIntent = Intent(context, MainActivity::class.java) loginIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK startActivity(loginIntent) } builder.show() ...

在强制下线时实现提示代码确定下线open class BaseActivity : AppCompatActivity() { private val receiver = object : BroadcastReceiver() { override fun onReceive(context: Context?, intent: Intent?) { if (intent?.action == "com.example.FORCE_OFFLINE") { // 强制下线 finish() val loginIntent = Intent(context, MainActivity::class.java) loginIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK startActivity(loginIntent) } } } override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) val filter = IntentFilter() filter.addAction("com.example.FORCE_OFFLINE") registerReceiver(receiver, filter) } override fun onDestroy() { super.onDestroy() unregisterReceiver(receiver) } }

这段代码是一个基础活动类 BaseActivity，它继承了 AppCompatActivity 类。在 onCreate() 方法中，它注册了一个广播接收器 receiver，用于接收强制下线的广播。当接收到广播时，会调用 finish() 方法结束当前活动，...

class SplashActivity : BaseActivity<BaseViewModel, ActivitySplashactivityBinding>() { override fun initView(savedInstanceState: Bundle?) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION) } var kv = MMKV.defaultMMKV() var token = kv.decodeString(ValueKey.TOKEN) // 使用 Handler.postDelayed 方法来延迟跳转 Handler(Looper.getMainLooper()).postDelayed({ if (TextUtils.isEmpty(token)) { toStartActivity(LoginActivity::class.java) } else { toStartActivity(ChooseLockerActivity::class.java) } finish() }, 2000) } override fun showToolBar() = false }

根据你提供的代码，无法直接确定问题的根本原因。这是一个 Kotlin 代码段，它似乎是为 Android 应用程序编写的。根据错误消息“java.lang.ArrayIndexOutOfBoundsException: length=1; index=1”，似乎是一个数组越界...

public abstract class BaseActivity extends AppCompatActivity implements BaseView{ public P presenter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(initLayout()); initView(); presenter = initPresenter(); if (presenter!=null){ presenter.attchView(this); } initDate(); } @Override protected void onDestroy() { super.onDestroy(); if (presenter!=null){ presenter.deatchView(); } } protected abstract int initLayout(); protected abstract void initView(); protected abstract void initDate(); protected abstract P initPresenter(); }这段代码什么意思

2. protected void onCreate(Bundle savedInstanceState): 重写了 AppCompatActivity 中的 onCreate 方法，在 Activity 创建时进行初始化操作，包括设置布局、初始化视图、初始化 Presenter 和数据等。 3. ...

public class TestActivity extends BaseActivity implements View.OnClickListener { private String TAG = getClass().getSimpleName(); /* JADX INFO: Access modifiers changed from: protected */ @Override // com.desaysv.dsvsettings.base.BaseActivity, android.support.v7.app.AppCompatActivity, android.support.v4.app.FragmentActivity, android.support.v4.app.SupportActivity, android.app.Activity public void onCreate(Bundle bundle) { super.onCreate(bundle); setContentView(R.layout.home_activity_test); LinearLayout linearLayout = (LinearLayout) findViewById(R.id.ll_content); for (int i = 0; i < linearLayout.getChildCount(); i++) { linearLayout.getChildAt(i).setOnClickListener(this); } getVersion(); initBackButton(); initBtnTime(); }

这段代码是一个 TestActivity 类，继承自 BaseActivity 类，实现了 View.OnClickListener 接口。在 onCreate() 方法中，首先调用了父类的 onCreate() 方法，然后通过 setContentView() 方法设置了布局为 R.layout....

public abstract class BaseActivity extends AppCompatActivity { static final String TAG = "tag"; public final String ACTION = "NIGHT_SWITCH"; protected BroadcastReceiver receiver; protected IntentFilter filter; @Override protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setNightMode(); filter = new IntentFilter(); filter.addAction(ACTION); receiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { Log.d(TAG, "onReceive: needRefresh"); needRefresh(); } }; registerReceiver(receiver, filter); } public boolean isNightMode(){ SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getBaseContext()); return sharedPreferences.getBoolean("nightMode", false); } public void setNightMode(){ if(isNightMode()) { SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getBaseContext()); Log.d(TAG, "setNightMode: " + sharedPreferences.getBoolean("nightMode", false)); this.setTheme(R.style.NightTheme); } else setTheme(R.style.DayTheme); } @Override protected void onDestroy() { super.onDestroy(); unregisterReceiver(receiver); } protected abstract void needRefresh(); }把activity改成fragment

3. 在 BaseFragment 类中，将 onCreate() 方法改为 onActivityCreated() 方法，并将方法参数改为 savedInstanceState 和 View 类型的布局视图对象。 4. 在 onActivityCreated() 方法中，调用 setNightMode() 方法，...

package com.blog.demo11; import android.annotation.SuppressLint; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.widget.ImageView; import androidx.annotation.Nullable; import com.blog.BaseActivity; import com.blog.R; import static android.view.MotionEvent.INVALID_POINTER_ID; /** * 可拖拽效果类。 */ public class ViewDragActivity extends BaseActivity { private ImageView backgroundImage; private ImageView image1; private ImageView image2; @SuppressLint("MissingInflatedId") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.drag_layout); backgroundImage = findViewById(R.id.background_image); image1 = findViewById(R.id.image1); image2 = findViewById(R.id.image2); // Set touch listeners for each image image1.setOnTouchListener(new MultiTouchListener()); image2.setOnTouchListener(new MultiTouchListener()); } private class MultiTouchListener implements View.OnTouchListener { private float lastTouchX, lastTouchY; private int activePointerId = INVALID_POINTER_ID; @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getActionMasked()) { case MotionEvent.ACTION_DOWN: { final int pointerIndex = event.getActionIndex(); final float x = event.getX(pointerIndex); final float y = event.getY(pointerIndex); lastTouchX = x; lastTouchY = y; activePointerId = event.getPointerId(pointerIndex); break; } case MotionEvent.ACTION_MOVE: { final int pointerIndex = event.findPointerIndex(activePointerId); final float x = event.getX(pointerIndex); final float y = event.getY(pointerIndex); final float dx = x - lastTouchX; final float dy = y - lastTouchY; v.setX(v.getX() + dx); v.setY(v.getY() + dy); lastTouchX = x; lastTouchY = y; break; } case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: { activePointerId = INVALID_POINTER_ID; break; } case MotionEvent.ACTION_POINTER_UP: { final int pointerIndex = event.getActionIndex(); final int pointerId = event.getPointerId(pointerIndex); if (pointerId == activePointerId) { final int newPointerIndex = pointerIndex == 0 ? 1 : 0; lastTouchX = event.getX(newPointerIndex); lastTouchY = event.getY(newPointerIndex); activePointerId = event.getPointerId(newPointerIndex); } break; } } return true; } } }

这是一个实现了可拖拽效果的 Android Activity 类，其中包含了三个 ImageView，分别是背景图 backgroundImage 和两个可拖拽的图片 image1 和 image2。通过实现 View.OnTouchListener 接口，对每个 ImageView 设置...

(activity as BaseActivity<*>)显示activity为空怎么办

如果(activity as BaseActivity<*>) 抛出了空指针异常，说明activity对象为null，此时不能进行类型转换。因此，你需要在进行类型转换前，先判断activity是否为空，例如： if (activity != null && activity is ...

package com.exampleytpeak.paizhao; import android.os.Bundle; import com.bm.library.PhotoView; import com.bumptech.glide.Glide; import butterknife.BindView; import butterknife.ButterKnife; public class ImageAct extends BaseActivity { @BindView(R.id.img) PhotoView img; @Override public void initLayout() { setContentView(R.layout.activity_image); } @Override public void initView() { Glide.with(this).load(getIntent().getStringExtra("path")).into(img); } @Override public void initData() { } @Override public void initEvent() { } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // TODO: add setContentView(...) invocation ButterKnife.bind(this); } }

这是一个 Android 应用的 Java 代码文件，其中包含了一个名为 ...在 onCreate() 方法中，调用 ButterKnife.bind(this); 来绑定视图控件和变量。此外，该类还继承了 BaseActivity 类，实现了该类中定义的抽象方法。

(activity as BaseActivity<*>)怎么使用

这段代码的含义是将一个Activity对象... (activity as BaseActivity<*>).doSomething() } 或者： (activity as? BaseActivity<*>)?.doSomething() 这样就可以避免因类型转换错误而导致的应用程序崩溃。

java.lang.NullPointerException: null cannot be cast to non-null type com.cyl.musiclake.ui.base.BaseActivity<*>

BaseActivity<*>)?.doSomething() 这里，我们使用了安全类型转换符“as?”来将activity转换为BaseActivity类型，如果activity为空，这个转换就会返回null，然后我们使用安全调用符号“?. ”来调用BaseActivity...

(activity as BaseActivity<*>)空指针错误

BaseActivity<*>)?.doSomething() 这里，我们使用了安全类型转换符“as?”来将activity转换为BaseActivity类型，如果activity为空，这个转换就会返回null，然后我们使用安全调用符号“?. ”来调用BaseActivity...

package com.exampleytpeak.paizhao; import android.os.Bundle; import android.view.Window; import android.view.WindowManager; import androidx.appcompat.app.AppCompatActivity; import butterknife.ButterKnife; public abstract class BaseActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); supportRequestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); initLayout(); ButterKnife.bind(this); initView(); initData(); initEvent(); } public abstract void initLayout(); public abstract void initView(); public abstract void initData(); public abstract void initEvent(); }

这是一个抽象类 BaseActivity，继承自 AppCompatActivity。它的作用是提供一个基础的 Activity 类，其他具体的 Activity 类可以继承 BaseActivity，从而简化代码的编写。该类的主要方法有 onCreate()、initLayout()...

package com.blog; import android.content.Context; import android.content.Intent; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import androidx.annotation.NonNull; import androidx.recyclerview.widget.RecyclerView; import java.util.ArrayList; public class SimpleAdapter extends RecyclerView.Adapter<SimpleAdapter.ViewHolder> { private final ArrayList<String> examples; private final ViewHolderListener viewHolderListener; private final Context context; public SimpleAdapter(Context context, ArrayList<String> examples, ViewHolderListener viewHolderListener) { this.context = context; this.examples = examples; this.viewHolderListener = viewHolderListener; } public void setViewHolderListener(ViewHolderListener viewHolderListener) { } public interface ViewHolderListener { void onItemClicked(View view, int adapterPosition); } @NonNull @Override public SimpleAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()) .inflate(R.layout.list_item_layout, parent, false); return new SimpleAdapter.ViewHolder(view, viewHolderListener); } @Override public void onBindViewHolder(@NonNull SimpleAdapter.ViewHolder holder, int position) { holder.tvContent.setText(examples.get(position)); } @Override public int getItemCount() { return examples.size(); } static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { private final TextView tvContent; private final ViewHolderListener viewHolderListener; ViewHolder(View itemView, ViewHolderListener viewHolderListener) { super(itemView); tvContent = itemView.findViewById(R.id.tv_content); this.viewHolderListener = viewHolderListener; itemView.findViewById(R.id.all_layout).setOnClickListener(this); } @Override public void onClick(View view) { if (null != viewHolderListener) { viewHolderListener.onItemClicked(view, getAdapterPosition()); // 点击后跳转到新的 Activity Intent intent = new Intent(view.getContext(), BaseActivity.class); view.getContext().startActivity(intent); } } } }这段代码什么意思

这段代码实现了一个简单的RecyclerView适配器，用于在Android应用程序中显示一组字符串列表。 ... 在适配器的构造函数中，需要传入一个上下文对象和一个字符串列表，用于初始化数据。在onCreateViewHolder()方法中...

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