安卓如何将sqlite数据从java传递到javascript

Question

我想将数据发送到javascript以显示在我的html页面中

这是我创建json的java代码，但我不知道如何将字符串变量转换为json对象，以及如何将其转换为javascript：

    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    myBrowser = (WebView)findViewById(R.id.mybrowser);

    final MyJavaScriptInterface myJavaScriptInterface = new MyJavaScriptInterface(this);
    myBrowser.addJavascriptInterface(myJavaScriptInterface, "AndroidFunction");

    myBrowser.getSettings().setJavaScriptEnabled(true);
    myBrowser.setWebChromeClient(new WebChromeClient());
    myBrowser.loadUrl("file:///安卓_asset/index.html");

    final SQLiteDatabase mydatabase1 = openOrCreateDatabase("CopyCollection", MODE_PRIVATE, null);
    String tmp = "";
    String JsonTxt = "";
    Cursor c = mydatabase1.rawQuery("SELECT * FROM Details ", null);
    if(c.moveToFirst()){
        do{
            String id = c.getString(0);
            String app = c.getString(1);
            String txt = c.getString(2);
            String text_time = c.getString(3);
            tmp += "{\"ID\":"+id+",\"App\":\""+app+"\",\"Content\":\""+txt+"\",\"Date\":\""+text_time+"\"},";
        }while(c.moveToNext());
    }
    JsonTxt = "["+tmp+"]";
    myBrowser.loadUrl("javascript:AlertContent("+JsonTxt+")");
    c.close();
    mydatabase1.close();}

JavaScript:

function AlertContent(msg){alert(msg);}

Answer 1

关于如何正确地将Java对象转换为JSON，请参见：Convert object to JSON in Android

要将此对象传递给JavaScript，可以使用WebView.evaluateJavascript方法，请参见How does evaluateJavascript work?；或者将WebView.loadUrl与javascript:方案一起使用，请参见this