java - 为什么会出现 "unreachable code"和 "variable not initialized"编译错误？

Question

嗨，我是 java 新手，正在尝试开发一个现有的 Anti-ragging 应用程序来支持较新的 api，例如 Gingerbread Lollipop 。我已经反编译了apk并提取了源代码并在Gradle系统中构建了它。

虽然源代码是正确的，但我在 java 代码中遇到了 3 个错误...一周以来一直无法弄清楚。

该应用程序包含 4 个屏幕。主屏幕有一个发送按钮来发送消息，第二个设置屏幕有两个按钮来设置我们要发送的消息和设置我们要发送消息的联系人...另外两个屏幕是自定义对话框布局设置测量和联系人。

这个主 Java 文件没有错误，仅供引用

MainActivity.java:

package com.eminem.sharath.antiragging;
import android.content.Intent;
import android.content.SharedPreferences;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.telephony.SmsManager;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageButton;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    String[] arrr1;
    private ImageButton ib1;
    private double latitude;
    private LocationManager lm;
    private double longitude;
    private SharedPreferences sp;
    private SharedPreferences sp1;

    protected void onCreate(Bundle paramBundle) {
        super.onCreate(paramBundle);
        setContentView(R.layout.activity_main);

        ActionBar actionBar = getSupportActionBar();
        actionBar.setLogo(R.mipmap.ic_launcher);
        actionBar.setDisplayShowHomeEnabled(true);
        actionBar.setDisplayUseLogoEnabled(true);

        this.ib1 = (ImageButton)findViewById(R.id.imageButton1);
        this.lm = (LocationManager)getSystemService(LOCATION_SERVICE);
        this.ib1.setOnClickListener(new View.OnClickListener() {
            public void onClick(View paramAnonymousView) {
                MainActivity.this.sp = MainActivity.this.getSharedPreferences("demo", 1);
                final String str1 = MainActivity.this.sp.getString("aaa", "");
                MainActivity.this.sp1 = MainActivity.this.getSharedPreferences("sdat", 1);
                String str2 = MainActivity.this.sp1.getString("snum", "");
                MainActivity.this.arrr1 = str2.split(",");
                Toast.makeText(MainActivity.this.getApplicationContext(), str2 + str1, Toast.LENGTH_SHORT).show();
                System.out.println("LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL" + str2 + str1);
                MainActivity.this.lm.requestLocationUpdates("gps", 1000L, 5.0F, new LocationListener() {
                    public void onLocationChanged(Location paramAnonymous2Location) {
                        Location localLocation = MainActivity.this.lm.getLastKnownLocation("gps");
                        MainActivity.this.latitude = localLocation.getLatitude();
                        MainActivity.this.longitude = localLocation.getLongitude();
                        Toast.makeText(MainActivity.this.getApplicationContext(), "Latitude:" + MainActivity.this.latitude + "\n" + "Longitude:" + MainActivity.this.longitude, Toast.LENGTH_SHORT).show();
                        String str = "http://maps.google.com/maps?=" + MainActivity.this.latitude + "," + MainActivity.this.longitude;
                        for (int i = 0; ; i++) {
                            if (i >= MainActivity.this.arrr1.length) {
                                return;
                            }
                            System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>" + MainActivity.this.arrr1);
                            SmsManager.getDefault().sendTextMessage(MainActivity.this.arrr1[i], null, str1 + " Come at this location" + str, null, null);
                        }
                    }

                    public void onProviderDisabled(String paramAnonymous2String) {
                    }

                    public void onProviderEnabled(String paramAnonymous2String) {
                    }

                    public void onStatusChanged(String paramAnonymous2String, int paramAnonymous2Int, Bundle paramAnonymous2Bundle) {
                    }
                });
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        startActivity(new Intent(getApplicationContext(), Settingss.class));
        return super.onOptionsItemSelected(item);
    }
}

这三个错误都在这个设置文件中...我已在错误旁边注释了错误名称以供引用。

Settings.java:

package com.eminem.sharath.antiragging;
import android.app.Dialog;
import android.content.ContentResolver;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.ContactsContract.CommonDataKinds.Phone;
import android.support.v7.app.AppCompatActivity;
import android.text.Editable;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.MultiAutoCompleteTextView;
import android.widget.MultiAutoCompleteTextView.CommaTokenizer;
import android.widget.Toast;
import java.io.PrintStream;
import java.util.ArrayList;

public class Settingss extends AppCompatActivity
{
    private ArrayList<String> alist = new ArrayList();
    private Button b1;
    private Button b2;
    SharedPreferences.Editor ed;
    private String setnum = "";
    SharedPreferences sp;

    protected void onCreate(Bundle paramBundle) {
        super.onCreate(paramBundle);
        setContentView(R.layout.contact);

        this.b1 = ((Button)findViewById(R.id.button1));
        this.b2 = ((Button)findViewById(R.id.button2));
        this.b1.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View paramAnonymousView)
            {
                Settingss.this.showDialog(1);
            }
        });
        this.b2.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View paramAnonymousView)
            {
                Settingss.this.showDialog(2);
            }
        });
    }

    protected Dialog onCreateDialog(int paramInt) {
        if (paramInt == 1) {
            final Dialog localDialog1 = new Dialog(this);
            localDialog1.setContentView(R.layout.tosetmessage);
            localDialog1.setTitle("Set Message");
            final EditText localEditText = (EditText)findViewById(R.id.editText1);
            Button localButton1 = (Button)findViewById(R.id.button1);
            Button localbutton2 = ((Button) findViewById(R.id.button2));
            localbutton2.setOnClickListener(new View.OnClickListener() {
                public void onClick(View paramAnonymousView) {
                    Settingss.this.sp = Settingss.this.getSharedPreferences("demo", 2);
                    Settingss.this.ed = Settingss.this.sp.edit();
                    Settingss.this.ed.putString("aaa", localEditText.getText().toString());
                    Settingss.this.ed.commit();
                    localDialog1.dismiss();
                }
            });
            localButton1.setOnClickListener(new View.OnClickListener()
            {
                public void onClick(View paramAnonymousView)
                {
                    localDialog1.dismiss();
                }
            });
            localDialog1.show();
        }
        while(true)
        {
            return super.onCreateDialog(paramInt);
            /*Error: unreachale statement*/     if (paramInt == 2)
            {
                final Dialog localDialog2 = new Dialog(this);
                localDialog2.setContentView(R.layout.multiautotext);
                localDialog2.setTitle("Set Contacts");
                final MultiAutoCompleteTextView localMultiAutoCompleteTextView = (MultiAutoCompleteTextView)localDialog2.findViewById(R.id.multiAutoCompleteTextView1);
                Button localButton2 = (Button)localDialog2.findViewById(R.id.button1);
                Button localButton3 = (Button)localDialog2.findViewById(R.id.button2);
                Cursor localCursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, "display_name ASC");
                if (localCursor.moveToFirst())
                {
                    do
                    {
                        String str1 = localCursor.getString(localCursor.getColumnIndex("display_name"));
                        String str2 = localCursor.getString(localCursor.getColumnIndex("data1"));
                        String str3 = str1 + "%" + str2;
                        this.alist.add(str3);
                    } while (localCursor.moveToNext());
                    ArrayAdapter localArrayAdapter = new ArrayAdapter(this, R.layout.simple_list_item, this.alist);
                    localMultiAutoCompleteTextView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
                    localMultiAutoCompleteTextView.setAdapter(localArrayAdapter);
                }
                localButton2.setOnClickListener(new View.OnClickListener()
                {
                    public void onClick(View paramAnonymousView)
                    {
                        String[] arrayOfString = localMultiAutoCompleteTextView.getText().toString().split(",");
                        int i = 0;
                        if (i >= arrayOfString.length)
                        {
                            System.out.println("************************" + Settingss.this.setnum);
                            Toast.makeText(Settingss.this.getApplicationContext(), Settingss.this.setnum, Toast.LENGTH_SHORT).show();
                            Settingss.this.sp = Settingss.this.getSharedPreferences("sdat", 2);
                            Settingss.this.ed = Settingss.this.sp.edit();
                            Settingss.this.ed.putString("snum", Settingss.this.setnum);
                            Settingss.this.ed.commit();
                            Settingss.this.setnum = "";
                            Settingss.this.finish();
                            return;
                        }
                        String str2;
                        if (arrayOfString[i].contains("%"))
                            str2 = arrayOfString[i].split("%")[1];
                        String str1;
                        for (Settingss.this.setnum = (Settingss.this.setnum + /*Error: Variable Str2 might not have been initialized*/  str2 + ",");; Settingss.this.setnum = (Settingss.this.setnum + str1 + ","))
                        {
                            i++;
                            break;
                            /*Error: unreachale statement*/     str1 = arrayOfString[i];
                        }
                    }
                });
                localButton3.setOnClickListener(new View.OnClickListener()
                {
                    public void onClick(View paramAnonymousView)
                    {
                        localDialog2.dismiss();
                    }
                });
                localDialog2.show();
            }
        }
    }
}

请帮助我调试应用程序。

我无意为该应用程序获取任何积分，因为我还没有开发它......只是想玩一下用户界面并体验一下新的 api。

Answer 1

return 语句将导致 onCreateDialog 方法return，并且任何后续行都不会被执行。这就是您收到无法访问代码错误消息的原因。同样，break 语句将导致 for 循环结束。任何后续行都不会被执行。

最后，您会收到 /*Error: Variable Str2 might not have beeninitialed*/ 错误，因为所有局部变量必须在首次使用之前进行初始化。