将android logcat保存在android设备上的文件中
我想在我的设备上的文件中写入Android logcat。 为此,我使用了以下代码将android logcat保存在android设备上的文件中,android,android-logcat,Android,Android Logcat,我想在我的设备上的文件中写入Android logcat。 为此,我使用了以下代码 protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if(isExternalStorageWritable()){ File appDirectory = new File(Environment.getExternalStorageDirectory(
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
if(isExternalStorageWritable()){
File appDirectory = new File(Environment.getExternalStorageDirectory()+ "/MyAppfolder");
File logDirectory = new File(appDirectory + "/log");
File logFile = new File(logDirectory, "logcat"+System.currentTimeMillis()+".txt");
if(!appDirectory.exists()){
appDirectory.mkdir();
}
if(!logDirectory.exists()){
logDirectory.mkdir();
}
if(!logFile.exists()){
try {
logFile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
try{
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if(checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
Process process = Runtime.getRuntime().exec("logcat -f "+logFile);
}
}
}
catch (IOException e){
e.printStackTrace();
}
}
else if (isExternalStorageReadable()){
Log.i(TAG, "ONLY READABLE");
}
else{
Log.i(TAG, "NOT ACCESSIBLE");
}}
public boolean isExternalStorageReadable(){
String state = Environment.getExternalStorageState();
if(Environment.MEDIA_MOUNTED.equals(state) || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)){
return true;
}
return false;
}
public boolean isExternalStorageWritable(){
String state = Environment.getExternalStorageState();
if(Environment.MEDIA_MOUNTED.equals(state)){
return true;
}
return false;
}
我在AndroidManifest.xml中添加了权限
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_LOGS"/>
文件夹和文件已创建,但文件始终为空。
如何改进代码,以便将日志猫写入文件。可能您没有将日志写入文件。您缺少此方法
/* Checks if external storage is available for read and write */
public boolean isExternalStorageWritable() {
String state = Environment.getExternalStorageState();
if ( Environment.MEDIA_MOUNTED.equals( state ) ) {
return true;
}
return false;
}
您的代码取自此问题的解决方案。请查看。可能您没有将日志写入该文件。您缺少此方法
/* Checks if external storage is available for read and write */
public boolean isExternalStorageWritable() {
String state = Environment.getExternalStorageState();
if ( Environment.MEDIA_MOUNTED.equals( state ) ) {
return true;
}
return false;
}
您的代码取自此问题的解决方案。请查看。很高兴回答您的问题 在我的项目中,我用这个来解决这个问题 1.添加此类
public class LogcatHelper {
private static LogcatHelper INSTANCE = null;
private static String PATH_LOGCAT;
private LogDumper mLogDumper = null;
private int mPId;
/**
* init data
*/
public void init(Context context) {
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {// sd first
PATH_LOGCAT = Environment.getExternalStorageDirectory()
.getAbsolutePath() + File.separator + "logcat";
} else {
PATH_LOGCAT = context.getFilesDir().getAbsolutePath()
+ File.separator + "logcat";
}
File file = new File(PATH_LOGCAT);
if (!file.exists()) {
file.mkdirs();
}
}
public static LogcatHelper getInstance(Context context) {
if (INSTANCE == null) {
INSTANCE = new LogcatHelper(context);
}
return INSTANCE;
}
private LogcatHelper(Context context) {
init(context);
mPId = android.os.Process.myPid();
}
public void start() {
if (mLogDumper == null)
mLogDumper = new LogDumper(String.valueOf(mPId), PATH_LOGCAT);
mLogDumper.start();
}
public void stop() {
if (mLogDumper != null) {
mLogDumper.stopLogs();
mLogDumper = null;
}
}
private class LogDumper extends Thread {
private Process logcatProc;
private BufferedReader mReader = null;
private boolean mRunning = true;
String cmds = null;
private String mPID;
private FileOutputStream out = null;
public LogDumper(String pid, String dir) {
mPID = pid;
try {
out = new FileOutputStream(new File(dir, "logcat"
+ getFileName() + ".log"));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
/**
*
* Level:*:v , *:d , *:w , *:e , *:f , *:s
*
*
* */
// cmds = "logcat *:e *:w | grep \"(" + mPID + ")\""; // print e level and ilevel info
// cmds = "logcat | grep \"(" + mPID + ")\"";// print all
// cmds = "logcat -s way";// print filter info
cmds = "logcat *:e *:i | grep \"(" + mPID + ")\"";
}
public void stopLogs() {
mRunning = false;
}
@Override
public void run() {
try {
logcatProc = Runtime.getRuntime().exec(cmds);
mReader = new BufferedReader(new InputStreamReader(
logcatProc.getInputStream()), 1024);
String line = null;
while (mRunning && (line = mReader.readLine()) != null) {
if (!mRunning) {
break;
}
if (line.length() == 0) {
continue;
}
if (out != null && line.contains(mPID)) {
out.write((getDateEN() + " " + line + "\n")
.getBytes());
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (logcatProc != null) {
logcatProc.destroy();
logcatProc = null;
}
if (mReader != null) {
try {
mReader.close();
mReader = null;
} catch (IOException e) {
e.printStackTrace();
}
}
if (out != null) {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
out = null;
}
}
}
}
public static String getFileName() {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
String date = format.format(new Date(System.currentTimeMillis()));
return date;
}
public static String getDateEN() {
SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String date1 = format1.format(new Date(System.currentTimeMillis()));
return date1;
}
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if(checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
Process process = Runtime.getRuntime().exec("logcat -f "+logFile);
}
}
LogcatHelper.getInstance((getApplicationContext()).start()代码>
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if(checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
Process process = Runtime.getRuntime().exec("logcat -f "+logFile);
}
}
希望我能帮助你。很高兴回答你的问题
if(checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
}
else{
Process process = Runtime.getRuntime().exec("logcat -f "+logFile);
}
在我的项目中,我用这个来解决这个问题
1.添加此类
public class LogcatHelper {
private static LogcatHelper INSTANCE = null;
private static String PATH_LOGCAT;
private LogDumper mLogDumper = null;
private int mPId;
/**
* init data
*/
public void init(Context context) {
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {// sd first
PATH_LOGCAT = Environment.getExternalStorageDirectory()
.getAbsolutePath() + File.separator + "logcat";
} else {
PATH_LOGCAT = context.getFilesDir().getAbsolutePath()
+ File.separator + "logcat";
}
File file = new File(PATH_LOGCAT);
if (!file.exists()) {
file.mkdirs();
}
}
public static LogcatHelper getInstance(Context context) {
if (INSTANCE == null) {
INSTANCE = new LogcatHelper(context);
}
return INSTANCE;
}
private LogcatHelper(Context context) {
init(context);
mPId = android.os.Process.myPid();
}
public void start() {
if (mLogDumper == null)
mLogDumper = new LogDumper(String.valueOf(mPId), PATH_LOGCAT);
mLogDumper.start();
}
public void stop() {
if (mLogDumper != null) {
mLogDumper.stopLogs();
mLogDumper = null;
}
}
private class LogDumper extends Thread {
private Process logcatProc;
private BufferedReader mReader = null;
private boolean mRunning = true;
String cmds = null;
private String mPID;
private FileOutputStream out = null;
public LogDumper(String pid, String dir) {
mPID = pid;
try {
out = new FileOutputStream(new File(dir, "logcat"
+ getFileName() + ".log"));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
/**
*
* Level:*:v , *:d , *:w , *:e , *:f , *:s
*
*
* */
// cmds = "logcat *:e *:w | grep \"(" + mPID + ")\""; // print e level and ilevel info
// cmds = "logcat | grep \"(" + mPID + ")\"";// print all
// cmds = "logcat -s way";// print filter info
cmds = "logcat *:e *:i | grep \"(" + mPID + ")\"";
}
public void stopLogs() {
mRunning = false;
}
@Override
public void run() {
try {
logcatProc = Runtime.getRuntime().exec(cmds);
mReader = new BufferedReader(new InputStreamReader(
logcatProc.getInputStream()), 1024);
String line = null;
while (mRunning && (line = mReader.readLine()) != null) {
if (!mRunning) {
break;
}
if (line.length() == 0) {
continue;
}
if (out != null && line.contains(mPID)) {
out.write((getDateEN() + " " + line + "\n")
.getBytes());
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (logcatProc != null) {
logcatProc.destroy();
logcatProc = null;
}
if (mReader != null) {
try {
mReader.close();
mReader = null;
} catch (IOException e) {
e.printStackTrace();
}
}
if (out != null) {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
out = null;
}
}
}
}
public static String getFileName() {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
String date = format.format(new Date(System.currentTimeMillis()));
return date;
}
public static String getDateEN() {
SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String date1 = format1.format(new Date(System.currentTimeMillis()));
return date1;
}
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if(checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
Process process = Runtime.getRuntime().exec("logcat -f "+logFile);
}
}
LogcatHelper.getInstance((getApplicationContext()).start()代码>
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if(checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
Process process = Runtime.getRuntime().exec("logcat -f "+logFile);
}
}
我希望我能帮助你
if(checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
}
else{
Process process = Runtime.getRuntime().exec("logcat -f "+logFile);
}
您的代码工作正常,可能是因为您错误地编写了“请求权限”和“生成日志文件”
您的代码工作正常,可能是由于错误,您已经同时编写了请求权限和制作日志文件您在哪里将内容写入文件?如果您将在比Marshmallow更旧的设备上运行应用程序,Logcat将不会存储在文件中。android版本为6.0.1。您在哪里将内容写入文件?如果您将在更旧的设备上运行应用程序,Logcat将不会存储在文件中安卓版本是6.0.1。是的,我从你提到的问题中得到了答案。我的代码中有此功能尝试在设备
设置>选择你的应用>权限>切换所有权限中授予你的应用权限。我不确定,但试一试。是的,我从你提到的问题中得到了答案。我的代码中有此功能尝试在设备设置>选择你的应用>权限>切换所有权限中授予你的应用权限。我不确定,但请试一试。谢谢你的帮助。你的回答解决了我的问题。谢谢你的帮助。你的回答解决了我的问题。