我正在尝试登录我的程序,以便它可以帮助我调试,但Log语句本身就是一个错误。我这样写了日志消息
import android.util.Log;
public static final String TAG = "MyActivity";
Log.e(TAG,"I shouldn't be here");
这是我在公共课上发表的声明。它给出了错误:
1. Syntax error on token "(", delete this token.
2. Syntax error on token, Variable Declarator Expected instead.
我是Android SDK开发和Java的新手,所以任何帮助都将受到赞赏。
感谢。
我在这里输入我的精确代码:
package com.android.record;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.util.Log;
//import com.android.record.R;
public class AudioRecordTest extends Activity {
private static final int RECORDER_SAMPLERATE = 8000;
private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
private AudioRecord recorder = null;
private Thread recordingThread = null;
private boolean isRecording = false;
public static final String TAG = "MyActivity";
@Override
Log.e(TAG,"I shouldn't be here");
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_audio_record_test);
setButtonHandlers();
enableButtons(false);
int bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,
RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING);
}
private void setButtonHandlers() {
((Button) findViewById(R.id.btnStart)).setOnClickListener(btnClick);
((Button) findViewById(R.id.btnStop)).setOnClickListener(btnClick);
}
private void enableButton(int id, boolean isEnable) {
((Button) findViewById(id)).setEnabled(isEnable);
}
private void enableButtons(boolean isRecording) {
enableButton(R.id.btnStart, !isRecording);
enableButton(R.id.btnStop, isRecording);
}
int BufferElements2Rec = 1024; // want to play 2048 (2K) since 2 bytes we use only 1024
int BytesPerElement = 2; // 2 bytes in 16bit format
private void startRecording() {
recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
RECORDER_SAMPLERATE, RECORDER_CHANNELS,
RECORDER_AUDIO_ENCODING, BufferElements2Rec * BytesPerElement);
recorder.startRecording();
isRecording = true;
recordingThread = new Thread(new Runnable() {
public void run() {
writeAudioDataToFile();
}
}, "AudioRecorder Thread");
recordingThread.start();
}
//Conversion of short to byte
private byte[] short2byte(short[] sData) {
int shortArrsize = sData.length;
byte[] bytes = new byte[shortArrsize * 2];
for (int i = 0; i < shortArrsize; i++) {
bytes[i * 2] = (byte) (sData[i] & 0x00FF);
bytes[(i * 2) + 1] = (byte) (sData[i] >> 8);
sData[i] = 0;
}
return bytes;
}
private void writeAudioDataToFile() {
// Write the output audio in byte
String filePath = "/sdcard/MyApp/8k16bitMono.pcm";
short sData[] = new short[BufferElements2Rec];
FileOutputStream os = null;
try {
os = new FileOutputStream(filePath);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
while (isRecording) {
// gets the voice output from microphone to byte format
recorder.read(sData, 0, BufferElements2Rec);
System.out.println("Short writing to file" + sData.toString());
try {
// writes the data to file from buffer stores the voice buffer
byte bData[] = short2byte(sData);
Log.v(TAG,"Am I here??"); // Here is my log!!
os.write(bData, 0, BufferElements2Rec * BytesPerElement);
} catch (IOException e) {
e.printStackTrace();
}
}
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private void stopRecording() {
// stops the recording activity
if (null != recorder) {
isRecording = false;
recorder.stop();
recorder.release();
recorder = null;
recordingThread = null;
}
}
private View.OnClickListener btnClick = new View.OnClickListener() {
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnStart: {
enableButtons(true);
startRecording();
break;
}
case R.id.btnStop: {
enableButtons(false);
stopRecording();
break;
}
}
}
};
// onClick of backbutton finishes the activity.
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
finish();
}
return super.onKeyDown(keyCode, event);
}
}
答案 0 :(得分:6)
@Override
Log.e(TAG,"I shouldn't be here");
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.e()
等方法调用应该在方法体中。他们不能直接在班级体内。所以,把它改成这样的东西:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.e(TAG,"I shouldn't be here");
答案 1 :(得分:5)
首先,导入日志(在您的班级之上(不在其中))=&gt;
import android.util.Log;
让您的代码找到您的登录调试窗口(您班级中的字段)=&gt;
public static final String LOG_TAG = "myLogs";
你需要2个参数你的标签+你的字符串(放在你的方法中)=&gt;
Log.d(LOG_TAG, "I shouldn't be here");
Log.v();
//详细
Log.d();
//调试
Log.i();
//信息
Log.w();
//警告
Log.e();
//错误
答案 2 :(得分:1)
如果看到Log class Page,您是否找到任何带有一个参数的Log.e
?您必须添加另一个参数才能使其正常工作。
Log.e("SOMETAG","I shouldn't be here");
答案 3 :(得分:0)
像这样使用:Log.e("YOUR LOG TAG", "YOUR LOG MESSAGE");
答案 4 :(得分:0)
您应首先添加引用此Log错误的String。
例如,创建一个名为TAG的String并将其添加到语句
private static final String TAG = "Your Tag";
Log.e(TAG, "I shouldn't be here");
答案 5 :(得分:0)
Log.e的原始格式如下代码所示:
Log.e(String tag,String msg)
所以你必须传递两个String
作为参数。因此,如果您想将某些内容显示为错误,可以这样写:
Log.e("TAG","I shouldn't be here");
希望它能正常运作。 您也可以像这样添加错误的全局标记
public static final String TAG = "MY_TAG";
Log.e(TAG, "I shouldn't be here");
答案 6 :(得分:0)
您可以使用Log.e("TAG", "Msg")
或Log.d("TAG", "Msg");
TAG
是将在LogCat的TID中显示的任何String
。假设Log.e("UserID", userId);
不要忘记导入:import android.util.Log;
答案 7 :(得分:0)
像这样使用
String p="rahul";
Log.e("SOMETAG","I shouldn't be here"+p);
答案 8 :(得分:0)
我可以根据您的经验给您一些提示,以使它变得更有效率。除了常规操作...
private static final String TAG = "Activity OR Class";
Log.e(TAG, "Value of variable: " + variable);
我还建议您放置您所在代码的位置。假设您有一个变量 count ,该变量用于 onCreate()和 anotherMethod(),并且您想记录其值。
Log.e(TAG, "onCreate() value of count: " + count);
Log.e(TAG, "anotherMethod() value of count: " + count);
因此,除了获取来自它的 TAG (类OR活动)之外,您还将获得记录此内容的method()OR位置!