WeChatLoginActivity

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.Gravity;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ProgressBar;

import com.annimon.stream.Stream;
import com.umeng.socialize.UMAuthListener;
import com.umeng.socialize.UMShareAPI;
import com.umeng.socialize.bean.SHARE_MEDIA;

import java.util.Map;

/** 通过这个Activity可以方便获取微信用户信息 */
public class WeChatLoginActivity extends Activity {

    public static void start(Activity activity, int requestCode) {
        Intent intent = createIntent(activity);
        activity.startActivityForResult(intent, requestCode);
    }

    public static void start(Fragment fragment, int requestCode) {
        Intent intent = createIntent(fragment.getContext());
        fragment.startActivityForResult(intent, requestCode);
    }

    private static Intent createIntent(Context context) {
        Intent intent = new Intent(context, WeChatLoginActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
        return intent;
    }

    /**
     * 获取用户名
     *
     * @param data {@link #onActivityResult(int, int, Intent)}回调的参数
     */
    public static String getUserName(Intent data) {
        return data.getStringExtra("name");
    }

    /**
     * 获取用户头像
     *
     * @param data {@link #onActivityResult(int, int, Intent)}回调的参数
     */
    public static String getUserAvatar(Intent data) {
        return data.getStringExtra("iconurl");
    }

    /**
     * 获取用户OpenId
     *
     * @param data {@link #onActivityResult(int, int, Intent)}回调的参数
     */
    public static String getUserOpenId(Intent data) {
        return data.getStringExtra("openid");
    }

    /**
     * 获取用户UnionId
     *
     * @param data {@link #onActivityResult(int, int, Intent)}回调的参数
     */
    public static String getUserUnionId(Intent data) {
        return data.getStringExtra("unionid");
    }

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setupLoadingLayout();
        hideStatusBar();

        clearAndGetUserInfo();
    }

    private void setupLoadingLayout() {
        ProgressBar progressBar = new ProgressBar(this);
        progressBar.setLayoutParams(
                new FrameLayout.LayoutParams(
                        FrameLayout.LayoutParams.WRAP_CONTENT,
                        FrameLayout.LayoutParams.WRAP_CONTENT,
                        Gravity.CENTER));
        FrameLayout frameLayout = new FrameLayout(this);
        frameLayout.addView(progressBar);
        setContentView(frameLayout);
    }

    private void hideStatusBar() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            //            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN);
            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_IMMERSIVE);
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            getWindow().setStatusBarColor(Color.TRANSPARENT);
        }
    }

    private void clearAndGetUserInfo() {
        UMShareAPI.get(this)
                .deleteOauth(
                        this,
                        SHARE_MEDIA.WEIXIN,
                        new UMAuthListener() {
                            @Override
                            public void onStart(SHARE_MEDIA share_media) {}

                            @Override
                            public void onComplete(
                                    SHARE_MEDIA share_media, int i, Map<String, String> map) {
                                getUserInfo();
                            }

                            @Override
                            public void onError(
                                    SHARE_MEDIA share_media, int i, Throwable throwable) {
                                setResult(Activity.RESULT_CANCELED);
                                finish();
                            }

                            @Override
                            public void onCancel(SHARE_MEDIA share_media, int i) {
                                setResult(Activity.RESULT_CANCELED);
                                finish();
                            }
                        });
    }

    private void getUserInfo() {
        UMShareAPI.get(this)
                .getPlatformInfo(
                        this,
                        SHARE_MEDIA.WEIXIN,
                        new UMAuthListener() {
                            @Override
                            public void onStart(SHARE_MEDIA share_media) {}

                            @Override
                            public void onComplete(
                                    SHARE_MEDIA share_media, int i, Map<String, String> map) {
                                Intent intent = new Intent();
                                Stream.of(map)
                                        .forEach(
                                                entry ->
                                                        intent.putExtra(
                                                                entry.getKey(), entry.getValue()));
                                setResult(Activity.RESULT_OK, intent);
                                finish();
                            }

                            @Override
                            public void onError(
                                    SHARE_MEDIA share_media, int i, Throwable throwable) {
                                setResult(Activity.RESULT_CANCELED);
                                finish();
                            }

                            @Override
                            public void onCancel(SHARE_MEDIA share_media, int i) {
                                setResult(Activity.RESULT_CANCELED);
                                finish();
                            }
                        });
    }
}

在Application初始化友盟

PlatformConfig.setWeixin(WX_APP_ID, WX_KEY);

集成到AndroidManifest

<activity
    android:name=".wxapi.WXEntryActivity"
    android:configChanges="keyboardHidden|orientation|screenSize"
    android:exported="true"
    android:theme="@android:style/Theme.Translucent.NoTitleBar" />

集成微信Activity

import com.umeng.socialize.weixin.view.WXCallbackActivity;

public class WXEntryActivity extends WXCallbackActivity {
}