Question

我正在尝试使用Picasso API for Android Studio Java从URL下载图像。单击浮动操作栏，将显示一个警告对话框，其中包含URL中的图像。

我试过以下事项： Picasso Target must not be null error。但我的错误仍在发生。

这是我目前正在使用的代码：

        FloatingActionButton FabViewImage = (FloatingActionButton) findViewById(R.id.fabPicture);
    if (FabViewImage != null)
        FabViewImage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Dialog settingsDialog = new Dialog(TabEmpOrder.this);
                settingsDialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
                settingsDialog.setContentView(getLayoutInflater().inflate(R.layout.order_detail_image_view, null));
                Context context = settingsDialog.getContext();
                settingsDialog.show();

                ImageView imgView = (ImageView) findViewById(R.id.imgOrderDetails);
                Picasso.with(context).load("http://i.imgur.com/Tnendik.png").into(imgView);
            }
        });

这是显示的错误消息

08-23 09:54:06.351 25488-25488/dura_art.bigbyte E/AndroidRuntime: FATAL EXCEPTION: main
Process: dura_art.bigbyte, PID: 25488
java.lang.IllegalArgumentException: Target must not be null.
at com.squareup.picasso.RequestCreator.into(RequestCreator.java:618)
at com.squareup.picasso.RequestCreator.into(RequestCreator.java:601)
at dura_art.bigbyte.TabEmpOrder$1.onClick(TabEmpOrder.java:99)//This is where it breaks
at android.view.View.performClick(View.java:5697)
at android.view.View$PerformClick.run(View.java:22526)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

我哪里出错了？我该如何解决？

Answer 1

这样做

View v = getLayoutInflater().inflate(R.layout.order_detail_image_view, null);
settingsDialog.setContentView(v);
            Context context = settingsDialog.getContext();
            settingsDialog.show();
ImageView imgView = (ImageView) v.findViewById(R.id.imgOrderDetails);
            Picasso.with(context).load("http://i.imgur.com/Tnendik.png").into(imgView);

Answer 2

您必须从用于ImageView的布局中获取AlertDialog，请尝试以下代码：

        @Override
        public void onClick(View view) {
            Dialog settingsDialog = new Dialog(TabEmpOrder.this);
            settingsDialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
            View layout = getLayoutInflater().inflate(R.layout.order_detail_image_view;
            ImageView imgView = (ImageView) layout.findViewById(R.id.imgOrderDetails);

            settingsDialog.setContentView(layout, null));
            Context context = settingsDialog.getContext();
            settingsDialog.show();


            Picasso.with(context).load("http://i.imgur.com/Tnendik.png").into(imgView);
        }

传递给ImageView时null picasso为function startGame() { game.start(); game.createSquare('red', 100, 10, 10, 10); } function updateGame() { game.clear(); //lines below are causing issues game.x += game.delta; // set new position // if rectangle touches right side (remember about the width of rectangle), // or touches left side of canvas, revert direction if(game.x > game.canvas.width - game.width || game.x <= 0){ game.delta *= -1; } game.update(); } var game = { //create the canvas element canvas: document.createElement('canvas'), //set up the canvas start: function () { this.context = this.canvas.getContext('2d'); this.canvas.height = 400; this.canvas.width = 400; document.body.insertBefore(this.canvas ,document.body.childNodes[0]); }, //clear the canvas clear: function() { this.context.clearRect(0, 0, this.canvas.width, this.canvas.height); }, //create Square createSquare: function(color, height, width, x, y) { this.height = height; this.width = width; this.color = color; this.x = x; this.y = y; this.delta = 1; // this is speed and direction of movement this.update = function(){ this.context.fillStyle = this.color; this.context.fillRect(this.x , this.y , this.width, this.height); } } } startGame(); setInterval(updateGame,50);，但现在却不可能。

URL文件下载的Picasso Target Null Error。 Java的

2 个答案: