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打开别人的项目不能运行怎么办？

编程入门 行业动态 更新时间:2024-10-27 18:25:35

打开别人的<a href=https://www.elefans.com/category/jswz/34/1771421.html style=项目不能运行怎么办？"/>

打开别人的项目不能运行怎么办？

我发现好多萌新拿了别人的项目准备参考，但是打开后跑不起来，调了半天也摸不清头脑

所以总结一下我的经验，希望能帮到大家

原因可能有以下几种

1.gradle版本不匹配

解决方法：（1）用studio新建一个项目,打开app目录下build.gradle文件把compileSdkVersion minSdkVersion targetSdkVersion改成一样的版本号dependencies引用的库也改成一样的版本（2）打开gradle目录下的gradle-wrapper.properties文件，把 distributionUrl改成一样（3）打开与app目录同级的build.gradle文件，把dependencies改成一样（4）sync（同步）

2.网络原因

有些库是Google提供的需要在与app目录同级的build.gradle文件中的buildscript结构的repositories结构下和allprojects结构的repositories结构下加google()

buildscript {
    
    repositories {
        google()

}

}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

还有一种是网络卡的情况，下载第三方类库失败，build下面会显示好多链接xxxxxx.jar,重新sync就可以了

 

3.动态权限原因

android M以上就需要动态申请权限了，别人的项目可能年代久远没有动态申请权限，需要我们动态申请权限，先在AndroidManifest.xml文件中声明权限然后动态获取

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
public class MainActivity extends AppCompatActivity {

    private static final int NOT_NOTICE = 2;//如果勾选了不再询问
    private AlertDialog alertDialog;
    private AlertDialog mDialog;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_permission);

        myRequetPermission();
    }

    private void myRequetPermission() {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
        }else {
            Toast.makeText(this,"您已经申请了权限!",Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        if (requestCode == 1) {
            for (int i = 0; i < permissions.length; i++) {
                if (grantResults[i] == PERMISSION_GRANTED) {//选择了“始终允许”
                    Toast.makeText(this, "" + "权限" + permissions[i] + "申请成功", Toast.LENGTH_SHORT).show();
                } else {
                    if (!ActivityCompat.shouldShowRequestPermissionRationale(this, permissions[i])){//用户选择了禁止不再询问

                        AlertDialog.Builder builder = new AlertDialog.Builder(PermissionActivity.this);
                        builder.setTitle("permission")
                                .setMessage("点击允许才可以使用我们的app哦")
                                .setPositiveButton("去允许", new DialogInterface.OnClickListener() {
                                    public void onClick(DialogInterface dialog, int id) {
                                        if (mDialog != null && mDialog.isShowing()) {
                                            mDialog.dismiss();
                                        }
                                        Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                                        Uri uri = Uri.fromParts("package", getPackageName(), null);//注意就是"package",不用改成自己的包名
                                        intent.setData(uri);
                                        startActivityForResult(intent, NOT_NOTICE);
                                    }
                                });
                        mDialog = builder.create();
                        mDialog.setCanceledOnTouchOutside(false);
                        mDialog.show();



                    }else {//选择禁止
                        AlertDialog.Builder builder = new AlertDialog.Builder(PermissionActivity.this);
                        builder.setTitle("permission")
                                .setMessage("点击允许才可以使用我们的app哦")
                                .setPositiveButton("去允许", new DialogInterface.OnClickListener() {
                                    public void onClick(DialogInterface dialog, int id) {
                                        if (alertDialog != null && alertDialog.isShowing()) {
                                            alertDialog.dismiss();
                                        }
                                        ActivityCompat.requestPermissions(PermissionActivity.this,
                                                new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
                                    }
                                });
                        alertDialog = builder.create();
                        alertDialog.setCanceledOnTouchOutside(false);
                        alertDialog.show();
                    }

                }
            }
        }
    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode==NOT_NOTICE){
            myRequetPermission();//由于不知道是否选择了允许所以需要再次判断
        }
    }
}

PS：6.0权限的基本知识，以下是需要单独申请的权限，共分为9组，每组只要有一个权限申请成功了，就默认整组权限都可以使用了

group1:android.permission-group.CONTACTS
    permission:android.permission.WRITE_CONTACTS
    permission:android.permission.GET_ACCOUNTS    
    permission:android.permission.READ_CONTACTS

  group2:android.permission-group.PHONE
    permission:android.permission.READ_CALL_LOG
    permission:android.permission.READ_PHONE_STATE 
    permission:android.permission.CALL_PHONE
    permission:android.permission.WRITE_CALL_LOG
    permission:android.permission.USE_SIP
    permission:android.permission.PROCESS_OUTGOING_CALLS
    permission:com.android.voicemail.permission.ADD_VOICEMAIL

  group3:android.permission-group.CALENDAR
    permission:android.permission.READ_CALENDAR
    permission:android.permission.WRITE_CALENDAR

  group4:android.permission-group.CAMERA
    permission:android.permission.CAMERA

  group5:android.permission-group.SENSORS
    permission:android.permission.BODY_SENSORS

  group6:android.permission-group.LOCATION
    permission:android.permission.ACCESS_FINE_LOCATION
    permission:android.permission.ACCESS_COARSE_LOCATION

  group7:android.permission-group.STORAGE
    permission:android.permission.READ_EXTERNAL_STORAGE
    permission:android.permission.WRITE_EXTERNAL_STORAGE

  group8:android.permission-group.MICROPHONE
    permission:android.permission.RECORD_AUDIO

  group9:android.permission-group.SMS
    permission:android.permission.READ_SMS
    permission:android.permission.RECEIVE_WAP_PUSH
    permission:android.permission.RECEIVE_MMS
    permission:android.permission.RECEIVE_SMS
    permission:android.permission.SEND_SMS
    permission:android.permission.READ_CELL_BROADCASTS

普通权限，只需要在AndroidManifest.xml中申请

 android.permission.ACCESS_LOCATION_EXTRA_COMMANDS
  android.permission.ACCESS_NETWORK_STATE
  android.permission.ACCESS_NOTIFICATION_POLICY
  android.permission.ACCESS_WIFI_STATE
  android.permission.ACCESS_WIMAX_STATE
  android.permission.BLUETOOTH
  android.permission.BLUETOOTH_ADMIN
  android.permission.BROADCAST_STICKY
  android.permission.CHANGE_NETWORK_STATE
  android.permission.CHANGE_WIFI_MULTICAST_STATE
  android.permission.CHANGE_WIFI_STATE
  android.permission.CHANGE_WIMAX_STATE
  android.permission.DISABLE_KEYGUARD
  android.permission.EXPAND_STATUS_BAR
  android.permission.FLASHLIGHT
  android.permission.GET_ACCOUNTS
  android.permission.GET_PACKAGE_SIZE
  android.permission.INTERNET
  android.permission.KILL_BACKGROUND_PROCESSES
  android.permission.MODIFY_AUDIO_SETTINGS
  android.permission.NFC
  android.permission.READ_SYNC_SETTINGS
  android.permission.READ_SYNC_STATS
  android.permission.RECEIVE_BOOT_COMPLETED
  android.permission.REORDER_TASKS
  android.permission.REQUEST_INSTALL_PACKAGES
  android.permission.SET_TIME_ZONE
  android.permission.SET_WALLPAPER
  android.permission.SET_WALLPAPER_HINTS
  android.permission.SUBSCRIBED_FEEDS_READ
  android.permission.TRANSMIT_IR
  android.permission.USE_FINGERPRINT
  android.permission.VIBRATE
  android.permission.WAKE_LOCK
  android.permission.WRITE_SYNC_SETTINGS
  com.android.alarm.permission.SET_ALARM
  com.android.launcher.permission.INSTALL_SHORTCUT
  com.android.launcher.permission.UNINSTALL_SHORTCUT

4.热更新问题

报错提示Unable to delete directory:\\...\build\xxxxxxxxx

原因是AndroidStudio默认支持热更新，只需在设置中关闭支持热更新的选项即可

Settings--Build,Execution,Deployment--Instant Run  关闭Enable Instant Run to hot swap code/resource changes  on deploy(default enable)

5.有关相机的项目除了要动态申请权限（参考3）外还要解决android.os.FileUriExposedExecution错误

解决方法：Step1.在AndroidManifest.xml文件中添加如下代码：

<application
        ...
        <provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="${applicationId}.provider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths"/>
        </provider>
    </application>

Step2.在res目录下新建一个xml文件夹，并且新建一个provider_paths的xml文件

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="/apk/res/android">
    <external-path name="external_files" path="."/>
</paths>
注意external-path代表了不同的文件目录，一共有五种，下面是官网的说明：
 <files-path name="name" path="path" /> 
Represents files in the files/ subdirectory of your app's internal storage area. This subdirectory is the same as the value returned byContext.getFilesDir(). 代表了Context.getFilesDir().

<cache-path name="name" path="path" />
Represents files in the cache subdirectory of your app's internal storage area. The root path of this subdirectory is the same as the value returned by getCacheDir().

<external-path name="name" path="path" />
Represents files in the root of the external storage area. The root path of this subdirectory is the same as the value returned byEnvironment.getExternalStorageDirectory().

<external-files-path name="name" path="path" />
Represents files in the root of your app's external storage area. The root path of this subdirectory is the same as the value returned byContext#getExternalFilesDir(String) Context.getExternalFilesDir(null).
<external-cache-path name="name" path="path" />

Represents files in the root of your app's external cache area. The root path of this subdirectory is the same as the value returned byContext.getExternalCacheDir().

Step3.修改代码

Uri photoURI = Uri.fromFile(createImageFile());

变成：


Uri photoURI = FileProvider.getUriForFile(context, context.getApplicationContext().getPackageName() + ".provider", createImageFile());

 

 

暂时写这么多，想起来再继续更。大家遇到问题及时留言哦，我会经常翻评论的。

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打开别人的项目不能运行怎么办？

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