Question

我想在两个活动之间切换，并且我放了一个if语句，但在我解析startActivity方法之后，应用程序崩溃了：

activity1.java

public class StartActivity extends AppCompatActivity {

    int count =0;
    SQLiteDatabase db;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        final Context context = this;
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_start);

        db=openOrCreateDatabase("StopSmokeDB", Context.MODE_PRIVATE, null);

        try {
             Cursor mCount = db.rawQuery("select count(*) from UserTable", null);
             mCount.moveToFirst();
             count= mCount.getInt(0);
         } catch (Exception e){
         } finally {
             if(count > 0){
                 finish();
                 Intent intent = new Intent(context, MainActivity.class);
                 startActivity(intent);
             } else {
                 finish();
                 startActivity(new Intent(this,RegActivity.class));
             }
         }
      }
}

的AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name="tzahianidgar.stopsmoke.RegActivity"></activity>
    <activity android:name="tzahianidgar.stopsmoke.StartActivity"></activity>
</application>

这是我的logcat： 04-10 05：57：38.316 3630-3630 / tzahianidgar.stopsmoke我/艺术：不迟到-Xcheck：jni（已经开启） 04-10 05：57：38.602 3630-3630 / tzahianidgar.stopsmoke W / System：ClassLoader引用未知路径：/data/app/tzahianidgar.stopsmoke-1/lib/x86 04-10 05：57：38.733 3630-3630 / tzahianidgar.stopsmoke W / System：ClassLoader引用未知路径：/data/app/tzahianidgar.stopsmoke-1/lib/x86

Answer 1

首先，你应该在使用之后关闭光标：

if(mCount != null)
   mCount.close();

其次，您在开始新活动之前关闭了当前活动。用以下代码替换finally块代码：

finally {
         if(mCount != null)
             mCount.close();

         if(count > 0){
             startActivity(new Intent(StartActivity.this,MainActivity.class));
             finish();
         } else {
             startActivity(new Intent(StartActivity.this,RegActivity.class));
             finish();
         }
     }

startActivity start

1 个答案: