Question

所以这就是问题所在，我正在尝试制作一个显示来自主应用程序的数据的叠加层，应用程序正在运行而没有错误，但实际上并没有显示数据。

Main.java：这是主应用程序，所有数据输入和其他内容都会发生。

package com.schnetzapps.myapplication;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.Switch;
import android.widget.TextView;

public class Main extends Activity {
    Switch toggleOverlaySwitch;
    TextView overlayLabel;
    EditText testText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setTheme(R.style.AppTheme);
        setContentView(R.layout.activity_main);

        LayoutInflater inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View vi = inflater.inflate(R.layout.overlay, null);
        overlayLabel = (TextView) vi.findViewById(R.id.overlayLabel);
        toggleOverlaySwitch = (Switch) findViewById(R.id.openOverlay);

        toggleOverlaySwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                toggleService();
                testText = (EditText) findViewById(R.id.testText);
                overlayLabel.setText(testText.getText());
                testText.setText(overlayLabel.getText());
            }
        });
    }

    private void toggleService(){
        Intent intent = new Intent(this, OverlayService.class);
        if(!stopService(intent)){
            startService(intent);
        }
    }
}

Overlay.java：这是一个叠加层，旨在显示用户信息，因为无论其他应用程序可能打开，它都会发生变化。包com.schnetzapps.myapplication;

        import android.app.Service;
        import android.content.Intent;
        import android.graphics.Color;
        import android.graphics.PixelFormat;
        import android.os.IBinder;
        import android.view.View;
        import android.view.WindowManager;
        import android.widget.LinearLayout;

public class Overlay extends Service {

    LinearLayout oView;

    @Override
    public IBinder onBind(Intent i) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        oView = new LinearLayout(this);
        int col =  Color.parseColor("#4286f4");
        oView.setBackgroundColor(col);
        int width = 500;
        int height = 500;
        int x = 0;
        int y = 0;
        WindowManager.LayoutParams params = new WindowManager.LayoutParams(width, height, x, y,
                WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
                        WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
                        WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
                PixelFormat.TRANSLUCENT);
        WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
        LinearLayout layout = (LinearLayout) View.inflate(this, R.layout.overlay, null);
        oView.addView(layout);
        wm.addView(oView, params);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if(oView!=null){
            WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
            wm.removeView(oView);
        }
    }

}

activity_main.xml：这是主应用程序的设计。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Switch
        android:text="Open Overlay"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/openOverlay" />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPersonName"
        android:text="Test"
        android:ems="10"
        android:id="@+id/testText" />
</LinearLayout>

overlay.xml：这是我正在尝试设置文本的标签的叠加设计。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/overlayLayout" >
        <TextView
            android:text="TextView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/overlayLabel" />
    </RelativeLayout>
</LinearLayout>

我没有得到任何空引用异常，指出我指向错误的TextView，并且叠加层根据需要切换很好，为什么叠加层上的文本不会更改为已输入EditText字段的内容？< / p>

截图叠加层未切换为打开，因此叠加层不可见：

已切换叠加层，但TextView未显示EditText中的文本：

我确信我错过了一些愚蠢的东西......非常感谢任何输入。

Answer 1

经过一番摆弄后，我发现解决方案当然是Intent系统：intent.putExtra(key, value);和intent.getStringExtra(key);

在上面的代码中，我更改了以下代码：

private void toggleService(){
    Intent intent = new Intent(this, OverlayService.class);
    if(!stopService(intent)){
        startService(intent);
    }
}

包含Intent推杆：

private void toggleService(String key, String value){
    Intent intent = new Intent(this, OverlayService.class);
    intent.putExtra(key, value);
    if(!stopService(intent)){
        startService(intent);
    }
}

在Overlay Service中，我更改了大部分代码，现在看起来像这样：

package com.schnetzapps.myapplication;

        import android.app.Service;
        import android.content.Intent;
        import android.graphics.Color;
        import android.graphics.PixelFormat;
        import android.os.IBinder;
        import android.view.View;
        import android.view.WindowManager;
        import android.widget.LinearLayout;
        import android.widget.TextView;

public class OverlayService extends Service {
    String data;
    LinearLayout oView;

    @Override
    public IBinder onBind(Intent i) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
    }

    public int onStartCommand (Intent intent, int flags, int startId) {
        data = intent.getStringExtra("testText");
        RunOverlay();
        return START_STICKY;
    }

    void RunOverlay () {
        oView = new LinearLayout(this);
        int col =  Color.parseColor("#4286f4");
        oView.setBackgroundColor(col);
        int width = 500;
        int height = 500;
        int x = 0;
        int y = 0;
        WindowManager.LayoutParams params = new WindowManager.LayoutParams(width, height, x, y,
                WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
                        WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
                        WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
                PixelFormat.TRANSLUCENT);
        WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
        LinearLayout layout = (LinearLayout) View.inflate(this, R.layout.overlay, null);

        oView.addView(layout);
        TextView t = (TextView)oView.findViewById(R.id.overlayLabel);
        t.setText(data);
        wm.addView(oView, params);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if(oView!=null){
            WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
            wm.removeView(oView);
        }
    }
}

结果当然是当切换更改时，叠加窗口将显示EditText字段中的文本。

Android Studio - 在叠加活动中显示主要活动的信息

1 个答案: