四、如何用WebView下载软件？

public class MainActivity extends AppCompatActivity {

    private WebView mWebView;

    private Button mBack;

    private TextView mTitleView;

    private Button mRefresh;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mBack = (Button) findViewById(R.id.back);

        mTitleView = (TextView) findViewById(R.id.titleView);

        mRefresh = (Button) findViewById(R.id.refresh);

        mBack.setOnClickListener(new MyListener());

        mRefresh.setOnClickListener(new MyListener());

        mWebView = (WebView) findViewById(R.id.webView);

        mWebView.loadUrl("http://shouji.baidu.com/");

        //该方法作用为当一个网页跳转另一个网页时，仍然在当前webview中显示

        mWebView.setWebViewClient(new WebViewClient());

        //该方法是接收标题

        mWebView.setWebChromeClient(new WebChromeClient(){

            @Override

            public void onReceivedTitle(WebView view, String title) {

                mTitleView.setText(title);

                super.onReceivedTitle(view, title);

            }

        });

        mWebView.setDownloadListener(new DownloadListener() {

            @Override

            public void onDownloadStart(String s, String s1, String s2, String s3, long l) {

                Uri uri = Uri.parse(s);

                Intent intent = new Intent(Intent.ACTION_VIEW,uri);

                startActivity(intent);

            }

        });

    }

    class MyListener implements View.OnClickListener {

        @Override

        public void onClick(View view) {

            switch (view.getId()){

                case R.id.back:

                    finish();

                    break;

                case R.id.refresh:

                    mWebView.reload();

                    break;

                default:

                    break;

            }

        }

    }

}