我想更改按钮的文本，但我无法这样做，android studio 向我显示:无法解析方法 findViewById("int")。这是我的代码
package example.hudixts.app;
import android.media.AudioRecord;
import android.media.MediaRecorder.AudioSource;
import android.media.AudioFormat;
import android.widget.Button;
public class recorderThread extends Thread {
public boolean recording; //variable to start or stop recording
public int frequency; //the public variable that contains the frequency value "heard", it is updated continually while the thread is running.
public recorderThread () {
}
@Override
public void run() {
AudioRecord recorder;
int numCrossing,p;
short audioData[];
int bufferSize;
bufferSize=AudioRecord.getMinBufferSize(8000,AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT)*3; //get the buffer size to use with this audio record
recorder = new AudioRecord (AudioSource.MIC,8000,AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT,bufferSize); //instantiate the AudioRecorder
recording=true; //variable to use start or stop recording
audioData = new short [bufferSize]; //short array that pcm data is put into.
while (recording) { //loop while recording is needed
if (recorder.getState()==android.media.AudioRecord.STATE_INITIALIZED) // check to see if the recorder has initialized yet.
if (recorder.getRecordingState()==android.media.AudioRecord.RECORDSTATE_STOPPED)
recorder.startRecording(); //check to see if the Recorder has stopped or is not recording, and make it record.
else {
recorder.read(audioData,0,bufferSize); //read the PCM audio data into the audioData array
//Now we need to decode the PCM data using the Zero Crossings Method
numCrossing=0; //initialize your number of zero crossings to 0
for (p=0;p<bufferSize/4;p+=4) {
if (audioData[p]>0 && audioData[p+1]<=0) numCrossing++;
if (audioData[p]<0 && audioData[p+1]>=0) numCrossing++;
if (audioData[p+1]>0 && audioData[p+2]<=0) numCrossing++;
if (audioData[p+1]<0 && audioData[p+2]>=0) numCrossing++;
if (audioData[p+2]>0 && audioData[p+3]<=0) numCrossing++;
if (audioData[p+2]<0 && audioData[p+3]>=0) numCrossing++;
if (audioData[p+3]>0 && audioData[p+4]<=0) numCrossing++;
if (audioData[p+3]<0 && audioData[p+4]>=0) numCrossing++;
}//for p
for (p=(bufferSize/4)*4;p<bufferSize-1;p++) {
if (audioData[p]>0 && audioData[p+1]<=0) numCrossing++;
if (audioData[p]<0 && audioData[p+1]>=0) numCrossing++;
}
frequency=(8000/bufferSize)*(numCrossing/2); // Set the audio Frequency to half the number of zero crossings, times the number of samples our buffersize is per second.
Button p1_button = (Button)findViewById(R.id.submits);
p1_button.setText(Integer.toString(frequency));
}//else recorder started
} //while recording
if (recorder.getState()==android.media.AudioRecord.RECORDSTATE_RECORDING) recorder.stop(); //stop the recorder before ending the thread
recorder.release(); //release the recorders resources
recorder=null; //set the recorder to be garbage collected.
}//run
}//recorderThread
我在这一行中收到此错误:
Button p1_button = (Button)findViewById(R.id.submits);
请帮助我，因为我是 Android 初学者，对此了解不多。提前致谢
最佳答案
因为通过 id 查找 View 是 activity class 中的方法 在 Activity 中写入您的线程对象 请记住，如果您想对 ui 进行一些更改，请确保将其放在 runOnUiThread 方法中检查 here
runOnUiThread(new Runnable(){
@Override
public void run(){
// change UI elements here
}});
这是您编写代码的方式
在 on create 方法中
Thread a=new Thread() {
public boolean recording; //variable to start or stop recording
public int frequency; //the public variable that contains the frequency value "heard", it is updated continually while the thread is running.
@Override
public void run() {
AudioRecord recorder;
int numCrossing,p;
short audioData[];
int bufferSize;
bufferSize=AudioRecord.getMinBufferSize(8000,AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT)*3; //get the buffer size to use with this audio record
recorder = new AudioRecord (AudioSource.MIC,8000,AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT,bufferSize); //instantiate the AudioRecorder
recording=true; //variable to use start or stop recording
audioData = new short [bufferSize]; //short array that pcm data is put into.
while (recording) { //loop while recording is needed
if (recorder.getState()==android.media.AudioRecord.STATE_INITIALIZED) // check to see if the recorder has initialized yet.
if (recorder.getRecordingState()==android.media.AudioRecord.RECORDSTATE_STOPPED)
recorder.startRecording(); //check to see if the Recorder has stopped or is not recording, and make it record.
else {
recorder.read(audioData,0,bufferSize); //read the PCM audio data into the audioData array
//Now we need to decode the PCM data using the Zero Crossings Method
numCrossing=0; //initialize your number of zero crossings to 0
for (p=0;p<bufferSize/4;p+=4) {
if (audioData[p]>0 && audioData[p+1]<=0) numCrossing++;
if (audioData[p]<0 && audioData[p+1]>=0) numCrossing++;
if (audioData[p+1]>0 && audioData[p+2]<=0) numCrossing++;
if (audioData[p+1]<0 && audioData[p+2]>=0) numCrossing++;
if (audioData[p+2]>0 && audioData[p+3]<=0) numCrossing++;
if (audioData[p+2]<0 && audioData[p+3]>=0) numCrossing++;
if (audioData[p+3]>0 && audioData[p+4]<=0) numCrossing++;
if (audioData[p+3]<0 && audioData[p+4]>=0) numCrossing++;
}//for p
for (p=(bufferSize/4)*4;p<bufferSize-1;p++) {
if (audioData[p]>0 && audioData[p+1]<=0) numCrossing++;
if (audioData[p]<0 && audioData[p+1]>=0) numCrossing++;
}
frequency=(8000/bufferSize)*(numCrossing/2); // Set the audio Frequency to half the number of zero crossings, times the number of samples our buffersize is per second.
Button p1_button = (Button)findViewById(R.id.submits);
p1_button.setText(Integer.toString(frequency));
}//else recorder started
} //while recording
if (recorder.getState()==android.media.AudioRecord.RECORDSTATE_RECORDING) recorder.stop(); //stop the recorder before ending the thread
recorder.release(); //release the recorders resources
recorder=null; //set the recorder to be garbage collected.
}//run} a.start();
关于java - 无法解析方法 findViewById ("int")，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29277998/