Android 从给定的视图中找不到合适的 parent

Question

我正在尝试通过在 Utils.java 文件中将其创建为函数来为我的应用程序实现通用 SnackBar 代码。一切正常，但每当我尝试打开此 SnackBar 时，我的应用程序总是崩溃。 logcat 中记录的错误是 java.lang.IllegalArgumentException: No suitable parent found from the given view. Please provide a valid view.

MainActivity.java、Utils.java和完整的logcat错误块中的示例代码如下。将不胜感激...提前致谢。

MainActivity.java

public class MainActivity extends AppCompatActivity {
public Utils util;
public Constants k;

@Override
protected void onCreate(Bundle savedInstanceState) {

    util = new Utils(this);
    k = new Constants();

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            util.snackBar("A Simple SnackBar!");
        }
    });

Utils.Java

import android.content.Context;
import android.content.Intent;
import android.support.design.widget.Snackbar;
import android.view.View;

import com.example.wp.wordpressvlog.MainActivity;
import com.example.wp.wordpressvlog.NewProductActivity;
import com.example.wp.wordpressvlog.R;

public class Utils {
    private Context _con;
    public View v;

    public Utils (Context _con) {
        this._con = _con;
    }
    public void snackBar(String msg) {
        Snackbar.make(v, msg, Snackbar.LENGTH_LONG).setAction("Action", null).show();
    }
}

logcat错误

07-05 20:17:52.125 18456-18456/com.movieduka.wp.wordpressvlog E/MultiWindowProxy: getServiceInstance failed! 07-05 20:18:37.595 18456-18456/com.movieduka.wp.wordpressvlog E/AndroidRuntime: FATAL EXCEPTION: main Process: com.movieduka.wp.wordpressvlog, PID: 18456 java.lang.IllegalArgumentException: No suitable parent found from the given view. Please provide a valid view. at android.support.design.widget.Snackbar.make(Snackbar.java:174) at com.movieduka.wp.wordpressvlog.utils.Utils.snackBar(Utils.java:29) at com.movieduka.wp.wordpressvlog.MainActivity.onClick(MainActivity.java:40) at android.view.View.performClick(View.java:5273) at android.view.View$PerformClick.run(View.java:21542) at android.os.Handler.handleCallback(Handler.java:815) at android.os.Handler.dispatchMessage(Handler.java:104) at android.os.Looper.loop(Looper.java:207) at android.app.ActivityThread.main(ActivityThread.java:5728) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)

Answer 1

utils.java 的变化

public void snackBar(String msg, View v) {
    Snackbar.make(v, msg, Snackbar.LENGTH_LONG).setAction("Action", null).show();
}

MainActivity.java

的变化

fab.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        util.snackBar("A Simple SnackBar!", view);
    }
});

Answer 2

这样改变你的方法

util.snackBar(view,"A Simple SnackBar!");
 public void snackBar(View view,String msg) {
    Snackbar.make(view, msg, Snackbar.LENGTH_LONG).setAction("Action", null).show();
}

Android 从给定的视图中找不到合适的 parent

Android No suitable parent found from the given view

java

android

android-snackbar