添加文本框到可穿戴屏幕 - 初学者

Question

以下是我用于从可穿戴设备读取心率的代码：

import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.support.wearable.activity.WearableActivity;
import android.util.Log;
import android.widget.TextView;
import android.hardware.*;
import android.support.wearable.view.BoxInsetLayout.*;

public class MainActivity extends WearableActivity implements SensorEventListener {

    private static final String TAG = "MainActivity";
    private TextView mTextViewHeart;
    SensorManager mSensorManager;
    Sensor mHeartRateSensor;
    SensorEventListener sensorEventListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);


        mTextViewHeart = new TextView(this);
        mTextViewHeart.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
        mTextViewHeart.setText("heart rate ");

        mSensorManager = ((SensorManager) getSystemService(SENSOR_SERVICE));
        mHeartRateSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_HEART_RATE);
       // mSensorManager.registerListener(this, mHeartRateSensor, SensorManager.SENSOR_DELAY_NORMAL);
        Log.i(TAG, "LISTENER REGISTERED.");
        mTextViewHeart.setText("Something here");

        mSensorManager.registerListener(this, mHeartRateSensor, mSensorManager.SENSOR_DELAY_FASTEST);

       // mSensorManager.registerListener(sensorEventListener, mHeartRateSensor, mSensorManager.SENSOR_DELAY_FASTEST);
    }


    public void onResume(){
        super.onResume();
    }

    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        Log.d(TAG, "onAccuracyChanged - accuracy: " + accuracy);
    }

    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_HEART_RATE) {
            String msg = "" + (int)event.values[0];
            mTextViewHeart.setText(msg);
            Log.d(TAG, msg);
        }
        else
            Log.d(TAG, "Unknown sensor type");
    }

}

main_activity.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@color/white">

    <android.support.wearable.view.GridViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.wearable.view.DotsPageIndicator
        android:id="@+id/page_indicator"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="10dp"
        android:padding="5dp"
        android:background="@drawable/rounded_background">
    </android.support.wearable.view.DotsPageIndicator>

</RelativeLayout>

传感器功能似乎很好。文本框没有显示在屏幕上，而是我只是收到一个空白屏幕。如何以编程方式将mTextViewHeart添加到屏幕？或者我需要通过main_activity.xml添加它吗？

更新：

import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.support.wearable.activity.WearableActivity;
import android.util.Log;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.hardware.*;
import android.support.wearable.view.BoxInsetLayout.*;

public class MainActivity extends WearableActivity implements SensorEventListener {

    private static final String TAG = "MainActivity";
    private TextView mTextViewHeart;
    SensorManager mSensorManager;
    Sensor mHeartRateSensor;
    SensorEventListener sensorEventListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);
        RelativeLayout relativeLayout = (RelativeLayout )findViewById(R.id.parent);

        mTextViewHeart = new TextView(this);
        mTextViewHeart.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
        mTextViewHeart.setText("heart rate ");

        mSensorManager = ((SensorManager) getSystemService(SENSOR_SERVICE));
        mHeartRateSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_HEART_RATE);
        Log.i(TAG, "LISTENER REGISTERED.");
        mTextViewHeart.setText("Something here");

        mSensorManager.registerListener(this, mHeartRateSensor, mSensorManager.SENSOR_DELAY_FASTEST);


        relativeLayout.addView(mTextViewHeart);

    }


    public void onResume(){
        super.onResume();
    }

    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        Log.d(TAG, "onAccuracyChanged - accuracy: " + accuracy);
    }

    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_HEART_RATE) {
            String msg = "" + (int)event.values[0];
            mTextViewHeart.setText(msg);
            Log.d(TAG, msg);
        }
        else
            Log.d(TAG, "Unknown sensor type");
    }

}

main_activity.xml：

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/parent"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white">

    <android.support.wearable.view.GridViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.wearable.view.DotsPageIndicator
        android:id="@+id/page_indicator"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="10dp"
        android:padding="5dp"
        android:background="@drawable/rounded_background">
    </android.support.wearable.view.DotsPageIndicator>

</RelativeLayout>

我已经更新了Pavneet Singh的答案，但显示了空白屏幕。

也许应该通过XML配置所有UI？

Update2：

更新以使用linearlayout没有影响：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:orientation="vertical" >

    <android.support.wearable.view.GridViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.wearable.view.DotsPageIndicator
        android:id="@+id/page_indicator"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="10dp"
        android:padding="5dp"
        android:background="@drawable/rounded_background">
    </android.support.wearable.view.DotsPageIndicator>

</LinearLayout>

package com.example.android.wearable.datalayer;

import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.support.wearable.activity.WearableActivity;
import android.util.Log;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.hardware.*;
import android.support.wearable.view.BoxInsetLayout.*;

public class MainActivity extends WearableActivity implements SensorEventListener {

    private static final String TAG = "MainActivity";
    private TextView mTextViewHeart;
    SensorManager mSensorManager;
    Sensor mHeartRateSensor;
    SensorEventListener sensorEventListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);
        LinearLayout relativeLayout = (LinearLayout )findViewById(R.id.parent);

        mTextViewHeart = new TextView(this);
        mTextViewHeart.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
        mTextViewHeart.setText("heart rate ");

        mSensorManager = ((SensorManager) getSystemService(SENSOR_SERVICE));
        mHeartRateSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_HEART_RATE);
        Log.i(TAG, "LISTENER REGISTERED.");
        mTextViewHeart.setText("Something here");

        mSensorManager.registerListener(this, mHeartRateSensor, mSensorManager.SENSOR_DELAY_FASTEST);


        relativeLayout.addView(mTextViewHeart);

    }


    public void onResume(){
        super.onResume();
    }

    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        Log.d(TAG, "onAccuracyChanged - accuracy: " + accuracy);
    }

    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_HEART_RATE) {
            String msg = "" + (int)event.values[0];
            mTextViewHeart.setText(msg);
            Log.d(TAG, msg);
        }
        else
            Log.d(TAG, "Unknown sensor type");
    }

}

添加edittext字段也不会显示：

<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="121dp"
    android:ems="10"
    android:text="test"
    />

问题可能是根本性的吗？

Answer 1

此屏幕布局显示：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linearLayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Click me to another screen" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="I'm screen 1 (main.xml)"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>