使用AsyncTask和重启方法的java

1 月，1 周 Questions & Answers 46

这是我的第一个项目，所以请原谅我的粗略代码，尤其是对于if（）这个东西；）我以后再修

1问题-当应用程序启动时，它不会在UI上显示我在活动主布局中所做的事情。当结果被发送到显示器时，我的UI会显示出来

我想我需要在某个地方添加AsyncTask。我试着效仿一些例子，但我做错了什么。也许有人能帮我找到我需要的代码和位置，在应用程序启动后立即查看我的应用程序界面

2问题-在第一个结果发送到屏幕后，如何在程序中重新启动录音任务？目前，我正在打破while循环，以便能够将文本发送到屏幕。如果我试图从循环中设置文本，在循环运行期间，什么都不会发生

提前谢谢

主要活动。java代码：

import 安卓.app.Activity;
import 安卓.media.AudioFormat;
import 安卓.media.AudioRecord;
import 安卓.media.MediaRecorder;
import 安卓.os.Bundle;
import 安卓.text.Html;
import 安卓.util.Log;
import 安卓.view.View;
import 安卓.widget.TextView;
import 安卓.widget.ToggleButton;


public class MainActivity 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;

public AudioRecord recorder = null;
int numCrossing, p, numSamples;
short audioData[];
public int frequency;
public boolean recording;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    String TAG = "tulemus";
    int bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,
            RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING);

    recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
            RECORDER_SAMPLERATE, RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING,     bufferSize);

    recorder.startRecording();
    recording = true;
    audioData = new short[bufferSize];
    int[] values;
    int k = 0, t = 0;

    values = new int[2];

    while (recording) {
        numCrossing = 0;
        numSamples = 0;
        recorder.read(audioData, 0, bufferSize);
        int mod = (bufferSize / 4) * 4;

        for (p = 0; p < mod; 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++;
            numSamples += 4;
        }
        for (p = 0; p < bufferSize; p++) {
            if (audioData[p] > 0 && audioData[p + 1] <= 0) numCrossing++;
            if (audioData[p] < 0 && audioData[p + 1] >= 0) numCrossing++;
            numSamples++;
        }

        frequency = (8000 / numSamples) * numCrossing;

        Log.d(TAG, String.valueOf(frequency));

        if (frequency >= 2550 && frequency <= 2750 && (values[0] != 2)) {
            values[0] = 1;
            values[1] = 2;
            k = 1;
        }//if

        if (frequency <= 3090 && frequency >= 2900 && (values[0] == 0)) {
            values[0] = 2;
            values[1] = 1;
            k = 1;
        }//if

        if (frequency <= 3090 && frequency >= 2900 && (values[0] == 1)) {
            t = 1;
            break;
        }//if

        if (frequency >= 2550 && frequency <= 2750 && (values[0] == 2)) {
            t = 2;
            break;
        }//if

        if (k != 0) {
            k = k + 1;
        }//if

        if (k == 20) {
            values[0] = 0;
            values[1] = 0;
        }//if

    }//while

    if (t == 1) {
        TextView textView = (TextView) findViewById(R.id.textView);
        String next = "<font color='#FF0000'>&#8679</font>";
        textView.setText(Html.fromHtml(next));
        values[0] = 0;
        values[1] = 0;
    }//if

    if (t == 2) {
        TextView textView = (TextView) findViewById(R.id.textView);
        String next = "<font color='#FFFF00'>&#8681</font>";
        textView.setText(Html.fromHtml(next));
        values[0] = 0;
        values[1] = 0;
    }//if

}//onCreate

public void onToggleClicked(View view) {
    // Is the toggle on?
    boolean on = ((ToggleButton) view).isChecked();

    if (on) {

    } else {
        System.exit(0);
    }
}

}

主要活动。xml代码：

<RelativeLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
xmlns:tools="http://schemas.安卓.com/tools"
安卓:layout_width="match_parent"
安卓:layout_height="match_parent"
安卓:paddingLeft="@dimen/activity_horizontal_margin"
安卓:paddingRight="@dimen/activity_horizontal_margin"
安卓:paddingTop="@dimen/activity_vertical_margin"
安卓:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity"
安卓:clickable="false"
安卓:id="@+id/RelLayout"
安卓:focusable="false"
安卓:visibility="visible"
安卓:background="#ff000000">

<TextView
    安卓:layout_width="200dp"
    安卓:layout_height="1000dp"
    安卓:textAppearance="?安卓:attr/textAppearanceLarge"
    安卓:id="@+id/textView"
    安卓:layout_alignParentTop="true"
    安卓:textSize="50sp" />

<Switch
    安卓:layout_width="wrap_content"
    安卓:layout_height="wrap_content"
    安卓:id="@+id/switch1"
    安卓:layout_alignParentTop="true"
    安卓:layout_alignParentRight="true"
    安卓:layout_alignParentEnd="true"
    安卓:checked="true"
    安卓:onClick="onToggleClicked"/>

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