Question

我有两个按钮，如果文件夹中没有文件，我想要禁用点击按钮运行时..但问题是按钮安装是否一直禁用..为什么？

        Button install = (Button) findViewById(R.id.install);
        final File file_1 = new File(Environment.getExternalStorageDirectory() + "/download/app-debug.apk");
        if(file_1.exists()){
            install.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Intent intent = new Intent(Intent.ACTION_VIEW);
                    intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory() + "/download/"+"app-debug.apk")),
                            "application/vnd.android.package-archive");
                    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    startActivity(intent);
                }

            });

        }else {

            install.setEnabled(false);

        }

    }

如果添加install.setEnabled（false）;在onResume（）按钮禁用所有时间，但如果从onResume（）删除..工作良好：（

    @Override
    public void onResume() {
        super.onResume();
        final File file = new File(Environment.getExternalStorageDirectory() + "/download/app-debug.apk");
        final Button down = (Button) findViewById(R.id.down);
        down.setEnabled(!file.exists());
        final Button install = (Button) findViewById(R.id.install);
        install.setEnabled(false);
    }

Answer 1

你有：

onCreate方法：

    Button install = (Button) findViewById(R.id.install);
    install.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory() + "/download/"+"app-debug.apk")),
                        "application/vnd.android.package-archive");
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivity(intent);
            }

        });

onResume方法：

     @Override
        public void onResume() {
            super.onResume();
            final File file = new File(Environment.getExternalStorageDirectory() + "/download/app-debug.apk");
            final Button down = (Button) findViewById(R.id.down);
            down.setEnabled(!file.exists());
            final Button install = (Button) findViewById(R.id.install);
            install.setEnabled(file.exists());
        }

如何禁用点击按钮？

1 个答案: