android java和webview交互demo

package wst.webview; import android.annotation.SuppressLint; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.webkit.WebView; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity { private WebView contentWebView = null; private TextView msgView = null; @SuppressLint("SetJavaScriptEnabled") @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); contentWebView = (WebView) findViewById(R.id.webview); msgView = (TextView) findViewById(R.id.msg); // 启用javascript contentWebView.getSettings().setJavaScriptEnabled(true); // 从assets目录下面的加载html contentWebView.loadUrl("file:///android_asset/wst.html"); Button button = (Button) findViewById(R.id.button); button.setOnClickListener(btnClickListener); contentWebView.addJavascriptInterface(this, "wst"); } OnClickListener btnClickListener = new Button.OnClickListener() { public void onClick(View v) { // 无参数调用 contentWebView.loadUrl("javascript:javacalljs()"); // 传递参数调用 contentWebView.loadUrl("javascript:javacalljswithargs(" + "'hello world'" + ")"); } }; public void startFunction() { Toast.makeText(this, "js调用了java函数", Toast.LENGTH_SHORT).show(); runOnUiThread(new Runnable() { @Override public void run() { msgView.setText(msgView.getText() + "\njs调用了java函数"); } }); } public void startFunction(final String str) { Toast.makeText(this, str, Toast.LENGTH_SHORT).show(); runOnUiThread(new Runnable() { @Override public void run() { msgView.setText(msgView.getText() + "\njs调用了java函数传递参数：" + str); } }); } }