JS调用onBackPressed
Posted 嘉禾世兴
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需求:
安卓页面webview加载H5页面,H5页面能能返回到安卓页面
import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.text.Editable; import android.text.TextUtils; import android.text.TextWatcher; import android.util.Log; import android.view.View; import android.view.inputmethod.InputMethodManager; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.EditText; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import com.outfit7.talkingfriends.gui.view.wardrobe.R; import com.outfit7.talkingfriends.gui.view.wardrobe.utils.TelecomUrl; public class TelecomActivity extends AppCompatActivity { /** * 自定义的,当js调用history.go时加载的链接,以监听history.go方法的调用 */ private final static String ON_BACK_PRESSED = "onBackPressed"; private static final String RETURN_FLAG = "ShijilongBack"; private ImageView telecomBack; private ImageView phoneClear; private EditText phoneNumber; private TextView telecomNext; private LinearLayout inputLayout; private String phone; private boolean payState = false; private WebView webView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_telecom); telecomBack = findViewById(R.id.telecomBack); phoneClear = findViewById(R.id.phoneClear); phoneNumber = findViewById(R.id.phoneNumber); telecomNext = findViewById(R.id.telecomNext); inputLayout = findViewById(R.id.inputLayout); //监听输入 phoneNumber.addTextChangedListener(new TextWatcher() { private CharSequence temp; @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { temp = s; } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } @Override public void afterTextChanged(Editable s) { if (temp.length() == 0) { phoneClear.setVisibility(View.INVISIBLE); telecomNext.setEnabled(false); } else if (temp.length() > 0 && temp.length() < 11) { phoneClear.setVisibility(View.VISIBLE); telecomNext.setEnabled(false); } else if (temp.length() == 11) { phoneClear.setVisibility(View.VISIBLE); telecomNext.setEnabled(true); } } }); //清空输入 phoneClear.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { phoneNumber.setText(""); phoneClear.setVisibility(View.INVISIBLE); telecomNext.setEnabled(false); } }); //返回 telecomBack.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { onBackPressed(); } }); //跳转 telecomNext.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { hideSoftKeyboard(); phone = phoneNumber.getText().toString(); inputLayout.setVisibility(View.GONE); loadWebView(); } }); } /** * 加载支付页面 */ private void loadWebView() { webView = new WebView(this); webView.getSettings().setjavascriptEnabled(true); webView.setWebViewClient(new WebViewClient() { @Override public void onPageFinished(WebView view, String url) { pageFinished(); super.onPageFinished(view, url); } @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { Log.i("wanglei", "url=" + url); overrideUrlLoading(url); return super.shouldOverrideUrlLoading(view, url); } }); webView.loadUrl(TelecomUrl.assembleUrl(phone)); setContentView(webView); } /** * 重写js页面window.history.go方法 */ public void pageFinished() { String script = "javascript:(function(){window.history.go = function(){window.location.href=\'" + ON_BACK_PRESSED + "\';}})()"; webView.loadUrl(script); } /** * 拦截url加载 */ public void overrideUrlLoading(String url) { if (url.contains(ON_BACK_PRESSED)) {//拦截返回和取消按钮http://cemp.189.cn:8080/pay/web/onBackPressed onBackPressed(); } else if (url.contains(RETURN_FLAG)) {//拦截支付返回结果,成功和失败都会包含ShijilongBack int beginIndex = url.indexOf("code=") + 5; String code = url.substring(beginIndex, beginIndex + 1); Log.i("wanglei", "code=" + code); if (!TextUtils.isEmpty(code)) { payState = ("0".equals(code) ? true : false); onBackPressed(); } } } /** * 隐藏软键盘 */ private void hideSoftKeyboard() { InputMethodManager imm = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE); imm.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS); } @Override public void onBackPressed() { //测试支付成功 if (payState) { setResult(RESULT_OK); } super.onBackPressed(); } }
代码中有些业务逻辑,可以自行删除
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