Question

我有一个set top padding and bottom margin for it的recyclerView：

implementation 'com.google.firebase:firebase-auth:18.0.0'
    implementation 'com.google.android.gms:play-services-auth:17.0.0'
    implementation 'com.google.firebase:firebase-database:18.0.0'
    implementation 'com.google.android.gms:play-services-ads:18.0.0'
    implementation 'androidx.cardview:cardview:1.0.0'
    implementation 'com.google.zxing:core:3.3.0'

//compile error code "Wrong 1st argument type. Found: 
'com.airvapps.garythebot.StartTutorials', required: 
'androidx.fragment.app.FragmentActivity'"

gso = new 
GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .build();
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .enableAutoManage(/*COMPILE ERROR */ this, new 
GoogleApiClient.OnConnectionFailedListener() {
                    @Override
                    public void onConnectionFailed(@NonNull 
ConnectionResult connectionResult) {
                    }
                }) 
                .addConnectionCallbacks(new 
GoogleApiClient.ConnectionCallbacks() {
                    @Override
                    public void onConnected(@Nullable Bundle bundle) {
                    }

                    @Override
                    public void onConnectionSuspended(int i) {

                    }
                })
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build();

还有Top Padding：

@Override
protected void directionDownScrolling(View recyclerView) {
    MarginLayoutParams params = (MarginLayoutParams) recyclerView.getLayoutParams();
    params.setMargins(0, 0, 0,
            (int) recyclerView.getContext().getResources().getDimension(R.dimen.dimen_recycler_view_spacing));
    mHandler.postDelayed(() -> recyclerView.setLayoutParams(params), 250);
}

如您所见，顶部填充没有延迟，但是我希望在250ms之后出现底部边距，

，但是一旦应用顶部填充，底部边距也会出现。为什么以及如何解决？

Answer 1

您正在从recyclerView获取布局参数：

MarginLayoutParams params = (MarginLayoutParams) recyclerView.getLayoutParams();

然后直接在其上设置边距：

params.setMargins(0, 0, 0,
        (int) recyclerView.getContext().getResources().getDimension(R.dimen.dimen_recycler_view_spacing));

因此延迟的消息不起作用：

mHandler.postDelayed(() -> recyclerView.setLayoutParams(params), 250);

如果将布局参数设置为其他实例，则将有所不同。而是延迟拨打setMargins：

@Override
protected void directionDownScrolling(View recyclerView) {
    MarginLayoutParams params = (MarginLayoutParams) recyclerView.getLayoutParams();
    int marginBottom = (int) recyclerView.getContext().getResources().getDimension(R.dimen.dimen_recycler_view_spacing));
    mHandler.postDelayed(() -> {
            params.setMargins(0, 0, 0, marginBottom);
            recyclerView.requestLayout();
    }, 250);
}

机顶填充会影响视图的下边距

1 个答案: