09:42 提问
尝试使用Intent跳转至新Activity时程序停止运行
package com.level1.yukinoshita.swan0;
import android.content.I
import android.os.B
import android.support.design.widget.FloatingActionB
import android.support.design.widget.S
import android.view.V
import android.support.design.widget.NavigationV
import android.support.v4.view.GravityC
import android.support.v4.widget.DrawerL
import android.support.v7.app.ActionBarDrawerT
import android.support.v7.app.AppCompatA
import android.support.v7.widget.T
import android.view.M
import android.view.MenuI
import com.level1.yukinoshita.fragment.Fragment_
import com.level1.yukinoshita.fragment.Fragment_
import com.level1.yukinoshita.fragment.Fragment_
import com.level1.yukinoshita.fragment.Fragment_
import com.level1.yukinoshita.fragment.Fragment_
import com.level1.yukinoshita.fragment.Fragment_
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private RecyclerView contentRecyclerV
private List&String& recycleViewD
private RecycleViewSimpleAdapter contentRecyclerViewA
private static final int STACK=0;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setTitle("");
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Snackbar.make(view, "正在刷新", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
super.onBackPressed();
public boolean onCreateOptionsMenu(Menu menu) {
// I this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return super.onOptionsItemSelected(item);
@SuppressWarnings("StatementWithEmptyBody")
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_socialuser) {
分配对应Fragment
Fragment_socialuser fragment = new Fragment_socialuser();
getFragmentManager().beginTransaction().replace(R.id.main_contentview, fragment).commit();
} else if (id == R.id.nav_socialaction) {
Fragment_socialaction fragment = new Fragment_socialaction();
getFragmentManager().beginTransaction().replace(R.id.main_contentview, fragment).commit();
} else if (id == R.id.nav_autocharge) {
Fragment_autocharge fragment = new Fragment_autocharge();
getFragmentManager().beginTransaction().replace(R.id.main_contentview, fragment).commit();
} else if (id == R.id.nav_replyaction) {
Fragment_replyaction fragment = new Fragment_replyaction();
getFragmentManager().beginTransaction().replace(R.id.main_contentview, fragment).commit();
} else if (id == R.id.nav_userfavor) {
Fragment_userfavor fragment = new Fragment_userfavor();
getFragmentManager().beginTransaction().replace(R.id.main_contentview, fragment).commit();
} else if (id == R.id.nav_searchall) {
Fragment_searchall fragment = new Fragment_searchall();
getFragmentManager().beginTransaction().replace(R.id.main_contentview, fragment).commit();
} else if (id == R.id.nav_settings) {
使用Activity
Intent intent = new Intent(this, Activity_settings.class);
startActivity(intent);
} else if (id == R.id.nav_developer) {
使用Activity
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
报错信息如下
04-15 01:34:22.769 /com.level1.yukinoshita.swan0 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.level1.yukinoshita.swan0, PID: 6114
android.content.ActivityNotFoundException: Unable to find explicit activity class {com.level1.yukinoshita.swan0/com.level1.yukinoshita.swan0.Activity_settings}; have you declared this activity in your AndroidManifest.xml?
at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1794)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1512)
at android.app.Activity.startActivityForResult(Activity.java:3917)
at android.app.Activity.startActivityForResult(Activity.java:3877)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:842)
at android.app.Activity.startActivity(Activity.java:4200)
at android.app.Activity.startActivity(Activity.java:4168)
at com.level1.yukinoshita.swan0.MainActivity.onNavigationItemSelected(MainActivity.java:125)
at android.support.design.widget.NavigationView$1.onMenuItemSelected(NavigationView.java:151)
at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:811)
at android.support.v7.view.menu.SubMenuBuilder.dispatchMenuItemSelected(SubMenuBuilder.java:84)
at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152)
at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958)
at android.support.design.internal.NavigationMenuPresenter$1.onClick(NavigationMenuPresenter.java:318)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
04-15 01:34:24.908 /com.level1.yukinoshita.swan0 I/Process: Sending signal. PID: 6114 SIG: 9
按赞数排序
你应该是没有在 AndroidManifest.xml文件中声明要跳转的Activity，所以跳转失败。
你是不是没有在 AndroidManifest.xml文件中注册要跳转的Activity，四大组件都得再清单文件中注册。
如果注册过后还报错的话,Intent intent = new Intent(this, Activity_settings.class);
startActivity(intent);在this前加上mainactivity.
这样写Intent intent = new Intent(MainActivity.this, Activity_settings.class);
startActivity(intent);
把别的文件代码发来我运行一下。。。。。。。。
没有在清单文件中找到你要跳转的界面
其他相似问题为什么我在跳转Activity时老是显示Activity已停止运行？
为什么我在跳转Activity时老是显示Activity已停止运行？代码应该没有错，跟老师的应该是一模一样的
代码和控制台异常贴出来看看
非常感谢！
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